CUNY Academic Commons

Last week, I used the "Insert Read More Tag" for a few posts on my site (https://historyprogram.commons.gc.cuny.edu/) without difficulty. This week, when I click on the icon, the read more tag is added, but at the bottom of my post, not where I'm trying to insert it. (See attached screenshot showing the 7 tags at the end of a post.) I've tried this on two PCs (one at the GC, the other at home), using Chrome and Firefox. I'm using the Radiate theme (since two weeks ago, it worked before). Please let me know what other info you need to look into this. Thanks!