Hi,
You mentioned that this issue only happens when you copy older content and paste it into a new post. How are you copying the older content? Are you copying it from the displayed webpage, or from the editor? If you’re copying it from the displayed webpage, I’m wondering if you’re possibly pulling in some unexpected characters that aren’t resolving correctly (page breaks, or something). Try to open up the older blog post using the “Edit Post” option, copy the text you want to duplicate from within the text editor box, and then paste it into your new post. That way, you can be sure you’re only pasting in alphanumeric characters. That could help determine if it’s an issue with the input, or an issue with the server/software.
