So your prefered frontend shows clones and the parent set with one and the same name?
And it doesn't even use the full descriptive name which the MAME -listxml gives...well...go and send your complain to the frontend author

Nobody forces you to copy all clones over to your frontend machine....if you're happy with just 1 19xx set fine, copy that....but remember, the set requires the qsound_hle device to run correctly. So either integrate that in your 19xx set or keep it standalone (that standalone device won't make 19xx appear multiple times)