Motors suddenly moving in wrong direction?

Elon

I'm working on a new hypercube evolution with a duet 3 mini 5+.

I've just tried my first benchy. At around 95-97% I noticed that I was shooting plastic in the air a bit forward (Y-10) from the front of the benchy's roof and stopped the print. I'm assuming I had collided with the roof as I made it that far with some layer shifting, but it was decent. Then I turned the machine off. No configuration was changed. When I came back again I noticed that home x worked fine.

Home Y suddenly did not work the same...

Home Y now sends the carriage right (x+) and toward me (y-). Assuming it started close enough to the y endstop (low end) to not crash on the x side before it hits the end of x then y homing completes. Much more movement went in the x+ direction than the y- when doing this. Thereafter x- doesn't work until I clear the y endstop. Clicking y+ goes back and left, getting me past the low end y stop. Then clicking Y- moves y- x+.

None of my config changed from the below which was working fine. The origin used to be at the front left of the machine. Or so it was before this benchy...

Any advise for where to go from here? Wires appear to be in order. The config wasn't changed. Did I fry something in one of the stepper drivers?

...
M569 P0.0 S1 ; physical drive 0.0 goes forwards
M569 P0.1 S1 ; physical drive 0.1 goes forwards
M569 P0.2 S1 ; physical drive 0.2 goes forwards
M569 P0.3 S1 ; physical drive 0.3 goes forwards
M569 P0.4 S1 ; physical drive 0.4 goes forwards
M584 X0.0 Y0.1 Z0.2:0.3 E0.4 ; set drive mapping

M92 X166.7 Y171.8 Z800.00 E400.00 ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y18000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00 ; set accelerations (mm/s^2)
M906 X1125 Y1125 Z900 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X220 Y220 Z265 S0 ; set axis maxima

; Endstops
M574 X1 S1 P"io5.in" ; configure switch-type (e.g. microswitch) endstop for low end on X via pin io5.in
M574 Y1 S1 P"io6.in" ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin io6.in
M574 Z1 S2 ; configure Z-probe endstop for low end on Z

...

Elon

Ok, so that was painful, but mystery solved. I'm not sure how this happened, but my A motor pulley grub screws had come loose and that motor was only partially participating. I realigned the pulley, tightened the screws, and X and Y are back in business.