Massive input lag on both joy cons

[KnockOutGamer]

All inputs, have a huge 2-3 second delay. I am using split joy cons, and I can't play anything with a delay this huge.

I tried uninstalling and reinstalling the drivers and program entirely several times, several reboots. I downgraded from 7.1 to 6.4b and 6.4a, but neither worked. Not sure if this program is even being maintained anymore.

[StandieNL]

Is the delay also perceivable in Gamepad Tester without using BetterJoy? Could just be a bad connection, as Joy-Cons have a terrible signal strength.