Objects have non reset transforms

This method solved the problem. Exported a model from Maya and successfully uploaded it for review.

Make sure the model is positioned with y up, and makes sure all your scales are set to 100.
So scale your model down to 0.01, freeze transforms, then scale your model up to a 100. In other words, you submit your model with x y and z all being 100. (Make sure you export it in meters as your units. When exporting from Maya, there is a setting that you can use somewhere to manually export in meters)

Maybe it is indeed an issue with their system, idk . I have seen this topic come up a few times here , that's why I responded based on my personal experience with wildcat.
Some time it might really just be an issue from the software - https://www.cgtrader.com/forum/technical-q-a/non-reset-transforms

Could be an error with their system ( very unlikely) or there's indeed a problem with that particular object -"Base" .

Just make sure the pivot is at 0,0,0 on all axis with the mesh at the centre and reset transforms - this sets the scale values and rotation values to 100% and 0 respectively on all axis. In 3dsMax you do this with the Reset Xform Utility. In Maya it's done with Freeze Transformations under Modify menu.