I think I might have found the issue, I have uploaded an additional file "Speed it up.love (Fix for jumping issue on Mac)".
Can you try that and let me know if the issue still exists? Thanks :)
Yeah nice! The gravity is not based on delta time, don’t know how I missed that.
Since vsync is on, for people who have a 60hz monitor, game will run at 60fps and gravity will be applied around 60 times per second. But I guess either you have a higher refresh rate monitor or somehow your game run higher than 60fps, which caused the gravity being applied to the character way more that it should be.