I have found some games have Skips and Glitches in them.
3 games and Cores happened in are:
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Medabots RPG Mattbee Version on MGBA
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Mighty Morphin Power Rangers on SNES9X
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Aladdin in Gensis Plus GX
Updating the Retroarch Fixes is but not everyone use the lastest Nightly Version as can be Unstable.
Just thought I mention this just in case people are having Same Problems