Suggested

league search filter broken

i want to manage 2 cars per race so after choosing the time and 2 car leagues joined one of the results and it was single car league, it happened three times to me and cost me 3 penalties.
and there are no way to double check from the league info since it's not stated anywhere at it's info.

also i want specific race duration in filters.

Well, you could always view the league before joining it.  That doesn't fix the broken filters (I do check every once in awhile just to see what's out there) but it would prevent you from joining a 1 car league.