It shouldn't be a Poser bug, because many other users should have stumbled upon this weird effect, but I rather suspect something not necessarily wrong with your PC but rather not correctly supported by Poser. And the affected area is not necessarily easy to guess from the outside.
That's why I'm guessing the support will be more effective than we are at determining what's going on and at proposing a solution.

𝒫𝒽𝓎𝓁

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(っ◔◡◔)っ

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