Most MacBooks keep Bluetooth on when in sleep mode. There isn’t even a setting to stop it, the only option is to manually turn Bluetooth off before closing the lid or to use 3rd party software to automate turning it off.
I had a similar problem, but it went away when I added wefwef to my Home Screen. It seems to handle swipes differently and is much smoother when swiping back.
Feels very close to a native app after adding to the Home Screen.