I had the same issues yesterday and since it's a garage based bug, I tried re-installing the modpack with a garage-related mod less at time.
And it seems to me that the mod that is causing it is the Auxilium one that I use for camo switching between vehicles.
Do you guys having this bug are using this mod too?
If yes, try re-installing the modpack without it, and tell us if the bug is still there or not.