As I told you I'm not an expert in such vehicles, but it looks to me quite "innatural" a track mounted in that way, and on top of that it will quickly destroy the road wheels or vice-versa.
The "teeth" on the inner part of the tracks are only one row or two? If it's only one try to mount them the other way round. It could also be that the roadwheels are not properly mounted...
Ciao