This tool may (or may not) be helpful.  Click on the '...' button; then 'View profile data'.  In the 'Following' section, if you have more than 1 entry (you currently have 2), I think this means you have multiple Following lists.  These lists are likely to be mostly duplicates, but any differences may be interpreted inconsistently by clients (I think).  I believe that the duplicate lists are created based on how clients choose to add Follows (maybe based on which relay they default to?)  Then when you add a Follow, it may only get added to one of your duplicate lists or the other (I think).  I have found that consistently using the same client when adding a Follow seems to do the trick (in not creating duplicate Following lists).  It's obviously not very convenient; but it's what I'm going with for now.  Presumably, this is a technical issue that will eventually be solved protocol-wide.

https://nosta.me/npub1s277u5rww60te98w9umz6p7pjcxuus96cegdsf4y978qcqvu8jtq88dsym