Problem merging and renaming events

In the process of merging some events I used search to pull up some related Events. I selected two of them and then did a Create Event action which promptly made the photos disappear from my events. I cannot find them by looking through the events unless I put some sort of search term, in my case date, into the search bar. Then I get the event which is now titled, "untitled event." The event name "untitled event" cannot be renamed so as soon as I clear the date from search the photos disappear again.

Any guesses on how to fix this?