‘Read the rest of this entry’ not working

I run the Online Presence Blog @ https://OnlinePresence.blogsailor.com/

I’m noticing some corruption in old posts where I used ‘More’.

See: https://onlinepresence.blogsailor.com/2007/05/25/cloaking-affiliate-links/

When I click on the “Read the rest of this entry” nothing comes up.

I checked the MySQL database record for this post and I see “Read the rest of this entry” in the post content and nothing after that.

To me this seems like a corruption somewhere. Any clues as to how this could happen? Any plugins which can cause this?