Monitor flickering at 60hz but not 75hz?

I have the LG 23MP47HQ monitor which is 1080p and has a native refresh rate of 60hz. I overclocked it up to 75hz a while back but removed the overclock about a week ago. Today the monitor started flickering pretty badly. Basically going between normal brightness and a slightly different brightness very very quickly, which was annoying to say the least. I then switched it to 75hz and now the monitor either isn't flickering or is just barely noticeably flickering. I think I can notice it but my mind might be playing games with me. Does anyone know what might be causing this?
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More about monitor flickering 60hz 75hz
  1. The electronics might have gotten used to running@75Hz and/or your eyes might have adjusted to staring at a 75Hz screen for a while.
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