Printer moves 20mm instead of 10mm?

Hi. I installed Marlin from the GitHub Tronxy Tree on my TRONXY X5SA Pro 500. I uncomment the right printer in the firmware. I changed the number of Z-motors in the configuration.adv from 1 to 2 and all the motors move now. I changed the x (125) and y (125) home position because the printer was hitting the rear-right corner hardly. Homing works now near by the middle of the bed.

Strangely when I tell the printer to move 10mm in X or Y it actually moves 20mm . I did not change the steps/mm setting and in other forums people write the standard settings are right?

#elif WITH_TMC && WITH_TITAN
#define DEFAULT_AXIS_STEPS_PER_UNIT { 160, 160, 800, 764 }

What is the problem? Why does it move 20mm when I tell it to move 10mm?

Edited 5 time(s). Last edit at 12/08/2020 02:56PM by Dahah.

Perhaps the micro stepping is different from what you expect.

eg if it was 1/32 micro stepping last time, and now its 1/16 micro stepping, it moves twice as far with the same number of steps.

Most stock settings ive come across have 80 steps for both X & Y and this is in line with your findings Simply alter those and you should be good to go.
( if you were using .9 deg steppers then 160 would work but my guess is you have standard 1.8 deg stepper motors so 80 steps per mm will work )

Edited 2 time(s). Last edit at 12/09/2020 12:01PM by bigfilsing.

Ok, thanks. I checked the microstepping in configuration_adv.h and it's 1/16.

I checked the Tronxy config as well. 1 Microstep = 0.0127 mm. 1mm/0.0127 = 78.7401 steps/mm

I flashed again with steps/mm= 80,80,400,389 and it works.