Pitting on last lap

My driver is often making an unscheduled pit stop on the last lap, making me loose position, any idea why this happens and how to stop this?

Maybe you don't have enough fuel left to complete the last lap (0.1 liter is enough to pit on the last lap)  (sometimes it happens to me as well)

if you are online while that happens, just reduce pushlevel.
Most managers set pushlevel to 5 for the last lap. Then maybe fuel is to low for PL5, but will last for lower PLs.

Check the race stats of your drivers, mainly the fuel consumption and remaining fuel when you enter pits in last lap.
Pretty sure what Fernando Znelle told you above is the reason for those unexpected pits in last lap.
0,1L less in your tank than what you need for last lap is enough to make them pit automatically.
Otherwise your cars would have abandoned the race (lack of fuel) just within 100 or 200 meters from finish.

Cool, will try that.

because your looking at the number wrong, you dont go up to x amount of laps.... you complete x amount of laps

Can you share a screenshot of your data from that race?

Sorry...  but either the link is wrong or that pit stop was 8 laps from the end of the race, not in last lap.
And besides we dont have acess to your tyre usage or fuel levels.

That's strange. You did not raise the push level on the last lap, I hope?

I know that during times when I've raised my push level on the final lap of a race accordingly, sometimes the pitbox says my driver is "PITTING" however on the final corner of the lap it returns to "PIT". Perhaps the next time you run this race, check your pitbox to make sure it does not say "PITTING" on the last lap and keep it on "PIT". This will have to be looked at by iGP staff so they can fix it.

When you say "behind start-finish line" you meant "AFTER",  not "behind" or "before" is that correct ?
If it is, there is only 1 explanation to that odd fact :
Without noticing it, you, accidentally pressed the "pit" button in last lap and called your driver.
There is no other way  to a driver enter pits and cross the finish line inside the pit lane.

As a matter of  fact, the full race chart you posted above tell us:

1) your car crossed the finish line (in lap 33) in 3rd place 0,8 secs behind leader.
2) at the moment the finish line was crossed you still had 1,5 lts of fuel left.

If the finish line was crossed inside the pit lane or not,  the chart doesnt tell us.
Assuming it was inside the pit lane, assuming also your pit box was "behind" finish line and therefore no refueling took place once the race was finished to your car since the moment finish line was crossed.... we still observe a staggering fact : you still had 1,5 liters left. So... what was he doing in pits ???

More... if it was such a tight fight between 3 cars for 1st place,  how do you explain you only lost 0,8 secs by entering pits and making all pit lane until finish line was crossed by your car ?
It seems to me if such had ocurred you wouldn´t have lost only 0,8 secs in such a tight fight with 2 other cars.
And entering pits in those conditions of fuel and just a few yards from finishing the race had to be called, never by itself.

@ Jack  Basford :
Looking forward to see the result of your investigation for this "unexplained" incident.  Of course it was a pit command .... (in case the car really finished the race in the pit lane, but we'll see that too i hope)

@ J.March :
1 - Assuming you too, ever raced in Montmeló (not here in IGP... but in real life with any motor vehicle) you should know that, despite the initially fast pit entry along the last curbe before the long straight, it has a slow chicane just before the pit boxes themselves. And it is located about 200 meters BEFORE the finish line in the straight that runs parallel to the pit lane. Something i believe you were totally unaware of .... probably you were blindfolded when you were there.

2- Yes i can read, thanks for asking. It was hard, took me about half a century of hard work to learn but i finally managed. That of course means i'm old already.
But also means that long before your fathers even think of having children (i.e. you and/or eventual bros or sisters) i was already seiing real GP's where drivers you probably never heard of, were there racing.
So.... do me a favor and dont patronize me.

3- Not gonna waste more time with any other post to you. I'll wait to see Jack's investigation :)

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Comnparing the real life and iGP version.. It actually looks as though the chicane was half drawn in.

I personally wouldn't go off iGP's lines per say.. Watch the top turn @ Abu Dhab.. They go half way in to the stands.. So track to line location is out..

As soon as the track builder is back online and working again.. These things will be fixed.. but I know it's frustrating to have these still..

Do you do iGP races on the map of the real track?

Ohh dear. You again hey...

Errr READ the dam posts properly.. I take it that you can actually read.. Use it.. It's a good skill. ;)

Joins just over 2 months ago and is an expert.. lmao..

If you actually knew what you just said in it's proper content.. You will understand how stupid that comment was that you've just made.. WHY GOD WHY DO THEY HAVE FREE ROAM..

Isn't there some youtube person you could be trolling instead? ;)

Ok Mr Expert.. IF iGP use the 100% lines you actually see.. Then explain the sudden speed busts out of some of the pits?? Ones where you are clearly coming out behind someone and then boom.. You end up 3 car lengths infront without the speed going up on the driver details??  They do not show changes in elevation either.