Question X carriage not aligned

[LoSpo]

Printer Model

Ender3 to switchwire

I didn't even know how could it possible.
Can someone tell me where I made a very very good mistake? My right rail is on the top, my left is about 4mm .
I take some measure, the X axis is crooke.

 

[mocho]

probably you have more tension in one belt then another. try to tension or realease one or another to see if it gets to alignment