Ender 3 Pro prints leaning
This looks a lot like layer shifting, both gradual and sudden.  This is frequently caused by excessive friction on one axis, the one along which the print is leaning.  You mentioned tightening the X-axis; if these are leaning along the X axis, chances are good the belt is too tight and causing something (either the belt or the toothed gear it is attached to) to rub against something else (the frame, the v-slot extrusion, the motor itself in the case of the belt gear).

Both the X and Y axes should be fairly easy to move by hand with the power off.  Feel for any points where that isn't true.