you probably need to change the steps in the startup script. I had to do this for my ctc.
G28 ; home all axes
M92 X80 Y79
G1 X0 Y0 Z0.1 F3000 ; get ready to prime
G92 E0 ; reset extrusion distance
G1 X100 E20 F600 ; prime nozzle
They should both be the same, but mine is the cheapest printer on the market for a reason :-)

You shoul;d be able to adjust or change it in your firmware - I can't do that with mine. But it's actually much easier to play around with settings in simplify3d startup script.

It could also by a loose belt.

Also it's an ender 3 clone - so, you know, expect problems.
Should have got the anet a8 plus instead.