Your motherboard manual should tell you where and how these things need to be plugged in.  If you don't have it, check the manufacturer's website for an online copy.  It's somewhat different for every one so it's kind of hard to just straight up tell you.

it just looks like the stylesheet isnt loaded. or some stylesheet isnt loaded. or you have something overriding it (some addon?)

The fix is to enable vertical sync, which forces the GPU to wait until the monitor has finished rendering a frame, before it can send it new frame data. As far as I know, there's no option like this for RPGMaker itself, so you just gotta find it in your GPU settings and enable it (many configuration tools for GPUs allows you to set these settings per-executable basis).