@britepencil. Ok. I think I understand what may have happened. It is possible that either the site was caching the old (3.8.x) files for the JModuleHelper or the new ModuleHelper.php wasn’t upgraded properly for whatever reason. The more I was just looking into it, the more I realized that the Joomla code is fine. So, it must just have been a one time issue during your particular upgrade.
Well, there is no problem now. If you have any further issues please don’t hesitate to let me know.