I can't tell either from your picture but I can't imagine that any lump or bump in the bunk door would be normal. There aren't lumps/bumps in my bunk doors on my 2014. I would have it checked out before your warranty is up. If they try to tell you it is normal, I would get something in writing that they looked at it and decided it was normal, just in case down the road it becomes an issue.
2016 Ram 1500 5.7 Hemi
2019 Coleman Light LX 2405BH
2015 Chevy Traverse
2011 Chevy Traverse (traded 2018)
2014 Solaire 147X (traded 2019)