Page gone 404 out of blue

I used to have a Network setup on my blog but could never get wildcard domains to work, so I deleted the code from the two files and went back to a regular setup and reloaded the files from the backup I had made right before going to the Super Admin setup.

For some reason though the first page of Older Entries ( https://chaseclark.com/page/2/ ) is now returning an error 404.

The weird thing is that the next two pages after ( https://chaseclark.com/page/3/ & https://chaseclark.com/page/4/ ) are both loading perfectly fine.

Any idea what could have caused this problem?