120hz vs IPS?

Did it happen with your other monitor at all? I would check GPU settings and monitor settings, but seeing a lot of blurring probably indicates that your pixel response times (i.e., the time it takes for a pixel to go from dark to light and vice versa) are really awful. Do you also notice any input lag? IPS panels do tend to be slower than TN panels on average, but good ones shouldn't be noticeably slow.