Just so you're able to see how to troubleshoot this --- using the Chrome extension and activating the placeholders, you can identify which one's are causing the issues.
I'm going to disable a few of these on the /80-over-50/ URL just to see if we can't get that page working right to start.
Is this occurring on more than a handful of pages?
If it's occurring in quite a few places, we might be better off having you disable wp-plugin placeholders for 'incontent_24' on down (so 25, 26, 27 etc.)