I got a bug, if you are CT then choose a custom knife and then you switch to TT, it will reset to your default CS knife but with your custom knife selected on menu
Edit: This does only happen because on Deathrun mode you only have a Knife as TT, it wont refresh, but if you give a TT a weapon it will give you your desired model.
Another suggestion is that Save selection has to be via Nick too, its useless if you are using your Rank System with Nick save.