Resolution problems when entering a game.

I recently bought a Lenovo legion 5 and, for some reason, whenever I enter a game, the resolution seems to drop from 1080p to about 720p-500p. When I tab out, the resolution seems fine on Teams, discord or other tabs that I have open, but the game always seem to have a worse resolution. Is this normal for a laptop or is it just mine thats being stupid? I have tried turning anti-liaising on/off and it made it slightly better, but it was still noticeable that the resolution was worse than it was supposed to be. I checked nvidia control panel, lenovo vantage app and Geforce Experience and they all show normal resolution. Im very confused, so help would be amazing. Thanks.

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[fixed][/fixed]