do a test. Lower the Z axis -100 before you try to start jogging the X axis. Also only hit the X right now -10, instead of the -100.
I am telling you tho try this because in an X movement to the -X like X-20, the X tower carriage will go up and the Y tower carriage will go down. However, this will be prevented if you are already at the X tower endstop. So lower the carriage to Z-100 and try to jog.
I am telling you tho try this because in an X movement to the -X like X-20, the X tower carriage will go up and the Y tower carriage will go down. However, this will be prevented if you are already at the X tower endstop. So lower the carriage to Z-100 and try to jog.