I had the same problem with my site imieicristalli.it. i had to repristinate a backup :-(. Can you please fit it in the next release?
My website has the same problem, usually emojis and ascii symbols are being replaced by weird characters.
But this happens only when I use the “Add nofollow” button.
So if you just stick to simply add your affiliate ID, your posts are safe.
It’s sad that the author seems to abandoned this project and doesn’t support it anymore, it was a great idea.
After hours of searching on Google for an alternative that add affiliate IDs to posts in bulk, I don’t seem to find one.
Thanks all for bringing this to our attention. We are working on debugging this and getting a fix in place.