Interestingly it works fine when tried in Incognito mode without login. But, the moment I login to inaturalist , it is reproducible on my incongnito mode too on chrome (negating cookies and cache issue that way!)
Also can’t replicate on Windows + Chrome; logged in or in incognito.
Do you have an extensions/plugins that you’ve also permitted while in incognito? Some extensions have settings such as “Permit Incognito”. If so, you might try disabling those as a test.
Same issue for me on Safari with Monterrey, but I do have some maps that don’t show it. https://www.inaturalist.org/taxa/1360268-Lycaena - this one does not show the “503” for me, but the two species under it do show it, as well as the genus. I do have other taxa that also show it.
I played around with observations listed in "Explore " around my location on the website. Some observations have this issue with maps and some do not have. Trying to see if there is a pattern to this.
I encountered this only when trying to enable the GBIF overlay for the map on a taxon page. Went to GBIF and there was a notice that their systems were having issues on the page.
Then my cat walked all over my keyboard and closed and restarted Chrome, which had had the “Relaunch to update” notification (I had been putting it off) and effectively updated Chrome for me. Now neither GBIF nor iNat maps are giving me any errors.