28.03.2010, 13:30
I think this is a rare SA-MP server streaming problem caused by the fact that the interior is right above Grove Street. The vehicles are streamed in while you are in the interior but the cols aren't loaded so they fall through the ground.
A fix could be scripted to change the player virtual world to non-0 when you are in an interior.
A fix could be scripted to change the player virtual world to non-0 when you are in an interior.