I recently replaced my aging but well dialled in FLSun Q5 with an Elegoo CC2.
I am very pleased at being able to print much larger things, but I get this effect at height. This is an egregious example but even cleaner prints still have obvious layer shifts.
The fact that it is just one side and not even across the z axis tells me that side lifted from warping. Clean your bed with soap and water, use a brim, and if those don’t work slow the print down. Long straight lines are prone to warping.