MKV files won't play as they used to

Hello, after updating K-lite codec pack to version 8.7.0 Full, I noticed a quality drop when playing my MKV files, there are some kind of “lines” present in the videos (that weren’t there before), mostly noticeable in the dark areas, and colors aren’t as good as before (check the attached images).
I tried going back to old versions but that didn’t work for me, please help!
Many thanks reply

Here are some screenshots reply


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