I think it's best to explain the problem in chronological order:

In October 2022, one of the Ezoic publisher managers recommended me to disable AMP on my blog -- citing it would boost my earnings.
Long story short, there are many complications, but the redirection from AMP to a regular responsive mobile page is done.
Fast forward to December 2022, I noticed a new error on GSC, "Page with redirect", which actually started back in October, around the same time I disabled AMP.
What's funny is the affected URLs are actually normal URLs, not AMP. But somehow, Google says they cannot be indexed because of the redirect error.
I have confirmed that there is no redirection on these affected URLs.
I tried finding some help from Google and forums, but they only cover HTTPS/HTTP/WWW error which is not the one I'm looking for.
I tried just validating the issue, but again, Google says the pages are redirected (so the validation is failed), even though they are not!

I'm really running out of ideas.

My traffic has been dwindling since October, probably because of the redirect issue.
Higher earning? Forget about that.

I'm hoping some of you could help me figure out the issue. Any little help would be greatly appreciated.

Thanks.