Race started with 1L too little fuel in first stint

Hopefully this is the right link: https://igpmanager.com/play/?url=race-result/112685/18752

I wanted to start the first stint with 28L of fuel, the game started me with 27L. Never seen this happen before in my other races, no idea how to reproduce, sorry. :(

I cannot, nor can others, see the exact Fuel Litres alongside each stint start.

If you put in 28L in the practice/set up screen where you do runs and get ready, yet the game started with 27 L, then I'm not sure where that extra 1L went, did you have a second driver on the same strategy per chance?

Are you sure you started with 27L?  By my calculation you will have started with 28L (or close to it).  At the end of the first lap you had 24.5L and at the end of the second you had 21L.  So that's 3.5L per lap (roughly).  24.5L + 3.5L = 28L.