Greetings,
first of all, how long have you been using your PSU? As i checked on the internet, the PSU isn't powerful, so if you been using it for a long time, the power delivery may be inefficient (Deteriorated).
Also, check if there isn't any software that's causing this problem, maybe even some kind of malware, from my experience, long ago my pc got infected and it messed up some of my mouse settings and other stuff and had similar symptoms as you mentioned.
One more thing you can try, is to check your monitor settings. I checked your monitor and i see that there is an option called Over Driver. Go to that and try to select other options. What Over Driver does is it changes the response times of your monitor ,and some options can cause input lag, ghosting etc.
The last thing you could do, (even tho i doubt it it will fix it) is to reinstall your drivers using DDU, you can check on youtube how to do it.