Chassis wheels are falling off on roblox player

Hello
Not sure if this is a bug or not but I have been experiencing this lately when working in my 4 year old game
all my vehicles are using A-Chassis and when in studio some vehicles have the wheels fallen off,some not,when in studio,theese vehicles act normally,no wheels fell off and they run normally but in player the wheels for some reason fall off and I’m trying to figure out if this is a bug or not,I have tried on a different place to reproduce the last actions made on the game but the wheels haven’t fell off
are there any suggestions I should try?