Graphical bug: double units

One user (edit: no, now two users) have discovered a strange graphical bug in my mod: It seems, that some unit-art is duplicated. But not all units, or all units of the same type, it seems to be random.







Does anyone have an idea?
Is it an graphical-only probem?
Any suggestions?

looks like you just need to edit your mesh groups and/or formation types

Thanks, this helps .
I didn't care much about the formations + meshgroups, i didn't think, it would cause something like this.