K40 with mini gerbel homing belts slipping like they are to tight

Hi everyone I have a k40 and use whisperer and lightburn I have a mini gerbl for lightburn everything have been fine untill tonight I ran whisperer and that was fine I needed to do something in lightburn so plugged my mini gerbel in when homing the machine the X axis seemed like it was slipping or belt to tight… in whisperer it was running fine no problem at all .anyone no what this could be.? Is it possible I have the axis pluged in the wrong ones

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