if you’re rapidly reloading the page with new coordinates over a short period of time, you might be encountering some sort of throttling. the next time you encounter a problem like what you’ve described, open the developer tools in your browser and look to see if there are any error messages in the console.
here’s an example of an earlier unrelated problem that was related to throttling: https://forum.inaturalist.org/t/searching-for-taxon-on-identify-stalls-out/4286. one of the posts in that thread has a screenshot of some error messages that shows throttling occurring.