If I had these figures on my 4G router I would expect to be dropping to 3G to get better download. Have no experience of 5G routers to know why you still connect at 5G successfully when you should by rights have no 4G upload.
I know. I don't understand the figures either. But it works?
Interestingly as I was replying to a comment, I had another failover event, and now look: