Hi @mcdonna,
Thanks for reaching out to us.
I agree with you speculation as its most likely a plugin conflict on your site.
In order to ascertain which plugin is causing the issue, you will need to deactivate the plugins one by one in order to narrow down on the plugin that is causing the issue.
Once you locate the problematic plugin, you can easily find an alternative of find the cause of the issue.
Hopefully this helps.
