They never answered me on this, either.
After an extensive period of looking through their PHP/JQuery, I was able to successfully make it assign individual IDs for each instance. When that didn’t work, I eliminated IDs altogether in favor of classes. This also proved to be a futile exercise. In the end I created a new WordPress page for each instance, and iframed them all into one page.
Kind of crazy considering multiple instances typically just work, but iframing got the job done. Good luck!
In the settings, with the default tick box checked, so I did not specify in the code.
In any case the issue resolved after removing all settings, specifying fitbounds in the code (instead of settings), and slowly adding each setting back. Not sure which one was breaking it.
Thanks for your time.