I'm not sure but I remember having had such problems before. Would you please mention which kind of collision you are using? Since a prop_dynamic is used here, they can have 2 different kinds of collisions:
If nothing helps, consider resetting the xForm of the collisionmodel itself in 3DS Max. Let us know if you were able to fix it.
You can find more information about both of these through the following links:
$collisionmodel
$collisionjoints
- A static one (like in static_props) which goes under the .QC command $collisionmodel.
- One used for animated props, such as dynamics or ragdolls, which go under the .QC command $collisionjoints.
If nothing helps, consider resetting the xForm of the collisionmodel itself in 3DS Max. Let us know if you were able to fix it.
You can find more information about both of these through the following links:
$collisionmodel
$collisionjoints