Third party applications and plugins from the Marketplace are reviewed at the surface for our certain rules and general breakage, however, we cannot perform in depth review of every add-on. For any issue you’re encountering you will want to disable all third party items to see if it is related. If after disabling, the issue is no longer present that would indicate a third party add-on is responsible. You will want to enable them one by one to see which one it is. Once you find it, you will want to see if there are any updates or if it’s compatible with the Invision Community version you’re on. If there is still an issue after that, you’ll want to contact the author for assistance.
Third party add-ons are still outside our scope of support and all risk is with yourself, the site owner.
While it is completely your decision to use these add-ons, we can only support our core software so the first step of diagnosis would be to disable the many which are installed and in this case, it resolved the issue so it would be up to you and the author of the add-on at hand to resolve it. I’m sorry I do not have better news for you.