You are right, I know what it is now! I found a tiny mistake in the attachment search feature in the next release. We added a feature to read the PDF and Word contents as descriptions, but it also conflicted with the other attachment types because of a tiny mistake.
I made an update on your staging, now it should be okay.
Attached the fixed beta version for your live site to this post. This is still a beta, let me know if you find any other mistakes in comparision to the previous release, I am more than happy to correct.