Please try testing for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
Thanks for updating the thread! Could it be possible that the Real Estate Plugin is having a conflict with the current version of WP? You may want to check its developer to see what they can find. Let us know how that goes. Hope this helps – thanks!