yes, i noticed about the yawdim, then i did some search and i`ve found it`s a bootleg of mk1. About the input, left and right are not swapped. The left input in P1 is always pressed.
ah that is fixable but it's difficult to describe how to fix it.
this video explains how it works, his first question is about X-men coin input being stuck on but the troubleshooting is the same for any button on most boards.