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.
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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.