I literally never used these but a few times. I'm more of an actual musician and didn't realize these were not for me.
The drum pad has 2 pads that can double trigger. I saw fixes online for it as it seems to be common, that seemed pretty simple, but I didn't try. It was just putting something behind the pad, I think some people were just using tape? But, I had no need to try and fix the double trigger because I just don't use them.
Literally bought them because they looked cool lol and realized I made a mistake when it was easier to use a keyboard and mouse to mix music, for me anyways.