Mouse DPI

I just got keymander 2 and beloader setup for my ps5 and I'm using a G305 wireless mouse. I notice when I try to set the DPI in the app to what my mouse is 12000dpi the mouse barely registers movement but when I lower the DPI in the app the sensitivity goes up. So right now I have the app DPI set to 600 and that seems to work ok but I'm just curious if this is a bug or a problem with my mouse not being compatible? I did set the DPI on my mouse to 12000 before I plugged it in. I am having a little trouble getting the sensitivity exactly where I want it. It seems to get unnaturally jittery when I have high sensitivity. So I guess two questions, one about the DPI setting seems to work backwards and are there tips to get really high sensitivity without the jitter?

Also what's up with https://keymander.iogear.com/ it seems all the recent posts are bots?