Strange Pacman behaviour

[eccs19]

I've got this strange mystery on my bartop that is just plain strange. I have installed Pacman and Pucman. With Pucman, all the normal patterns seem to work, but on Pacman, they don't work.  I have all the settings within mame set the same, so it's got me baffled.  The same one works fine on my regular computer, but things are just strange on my bartop. Pacman is the regular Midway rom(s). Anyone have any ideas?  I at first thought that it was just my controllers on the bartop, but that's when I tried Pucman, and all was fine.

Thanks!