Platform: Website (inaturalist.org)
Browser: Chrome, Firefox; appears to be irrespective of browser.
Screenshots of what you are seeing:
Sorry, no screenshot of my affiliation in the unaffiliated state, but it was. I re-affiliated, and now it shows correctly upon accessing it again:
Description of problem:
I have no means of replicating this.
However I had previously set my iNaturalist affiliation to Canada (iNaturalist.ca), although I regularly browse using the international portal (iNaturalist.org). I did not change my affiliation. (I have not even accessed my account settings for some time.) After seeing the banner, when I accessed my account settings, there was no affiliation; just the default. I then updated it to the Canadian option.
There was a previous thread in this vein, Erroneous banner prompting affiliation change, however that was an instance where the web interface incorrectly reported the user’s lack of affiliation and @carrieseltzer had stated that the issue was resolved. So this may be a new issue.
For my own purposes, it appears to be solved simply by going to the account settings and re-applying the affiliation.