Visible stripes are not considered “normal” scene detail, but in this case they can happen from how the image was captured and processed. Your photo appears to be heavily underexposed and then pushed several stops brighter in post. When shadows are lifted that much—especially from a high-ISO shot like ISO 1600—banding and other artifacts can show up.

So the most likely cause is underexposure plus aggressive shadow recovery, not backlight by itself. The banding does seem fairly strong, so a secondary cause is also possible, such as a filter in front of the lens creating interference patterns.

In short: this does not necessarily mean the camera is defective. First, try shooting with a more accurate exposure and avoid pushing the file so hard in post. If you used a front filter, remove it and test again. If the stripes still appear in properly exposed images without a filter, then it may be worth investigating the camera further.