Need help fixing my turntable set up

Hi,
I’ve had this turntable set up for a few years now and have recently ran into an issue I can’t seem to fix. The left speaker ports on two separate amps have started playing flawed audio whenever I plug them in. I know the issue isnt the cables or the speakers because they play perfect when I switch them to the right port. I also don’t think it’s the amps because I find it unlikely that the same port on two amps have suddenly stopped working properly.

Does anyone have any solutions I could try out.

Cheers.
 

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