snes super 8/tristar supergameboy mod gone wrong

hello, i have the snes super 8 NTSC version, i read a guide online on how to fix two issues it has that can be fixed with soldering on a cap and bridging an intentionally made gab on one of the leads. the super gameboy or any of the fx chip games will work properly unless this gab is patched, so i put a drop of solder on the gap and now the super gameboy works but not without all sorts of graphical errors, the sound works fine and the games also run at full speed. i cant figure out whats going on as other people have done this with no problem. my super gameboy works just fine and so do regular snes games. if needed i can post pictures of my soldering job and the guide i followed.