Do you have the older 100:1 ratio gear motor or the newer 131:1 gear motor?
If you have the 100:1 and are using the setting for 131:1 it will act like you describe, I think.
For 131:1 settings are:
Slide Full Open Position (count): 4100
Slide Home Offset (count): 590
For 100:1 settings are:
Slide Full Open Position (count): 3100
Slide Home Offset (count): 450
Go to Settings->Printer Settings and see which you have. Don't Reset as that will change all your settings (you should probably copy them all down just to have as a backup). Change just the Slide settings to the opposite value and don't forget to hit Save.
See how the new settings affect the motion and report back?
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