Trying to run clrmame pro with misfit mame .62

I created the DAT file from the misfit mame executable.
Instead of showing the 400-odd roms that I would expect to see, it shows 4705 roms - the number of roms in mame78.

I have created other DAT files from executables so I dont think that I am doing anything wrong, but I may be.

Has anyone created a DAT file for misfit mame? or have any ideas what I may be doing wrong.

thanks