Hi guys,
I was having the same problem. I’m going to share my solution just in case is useful for someone. In my case the reason was a Regex rewrite rule that I had with the Redirection plugin. The regex was basically mapping an old address to a new one, checking 2 random characters, like this:
/(\w){2}/(.*)
This was causing the problem. Now I’m using a more specific regex, giving the letter combinations that i want to handle:
/(ab|bc|de)/(.*)