Hi
I do not know what is causing it in the fist place, but it's being added between <head></head> section, so it's not a propper html and should not be simply hidden. If You have disabled all of the plugins and modules on this page and it still shows than it can only be caused by component. It's a good idea to try create this page again, it may or not fix the issue, but there's always a chance the issue will be passed while doing it somehow.