I think it was cause by the clip brushes you used and the fact that the bikes are "drivablevehicle"'s.
I don't know much about vehicles but my theory is that maybe the game "pushed" them out of the clip brushes to prevent them from getting stuck
so I think the final solution is to make the bikes static models
and delete all the "init { }" section of the tik's
so they look like this:
Code:
TIKI
setup
{
scale 0.52
path models/static/Accabike
skelmodel acca_bike4.skd
surface all shader bike2
surface seat shader bike_bits
surface tyre1 shader bike_bits
surface tyre2 shader bike_bits
}
animations
{
idle acca_bike4.skc
}
/*QUAKED static_Accabike_White-Chrome (0 0 0) (-40 -20 0) (40 20 50)
White Chrome BMW chopped single seat
*/