Thanks all for the helpful suggestions. If you all don't mind, I am going to add a bit more detail to my issue...
So I decided to adjust the number of lines all the way back to 50000, just to see any indication of any mention of the channel or the show that recorded. Going back that far ended up bringing the history back to February.
Anyway, regarding the random recording, the channel was Animal Planet ("ch6103") and the show that recorded for some reason was something called "Pit Bulls and Parolees"... The only mentions of "ch6103" prior to any logs relating to the recording was that I apparently tried to access that channel a month prior, but that there was an error during connection and its stream was subsequently closed.
The next mention of the channel was also the very first mention of the show, and this took place the day before the recording was to happen; the message reads:
"2021/05/11 19:18:44.426000 [DVR] Waiting 14h40m15.574007891s until next job 1620838740-ch6103 Pit Bulls and Parolees"
I tried looking for other instances of the Job number prior to that and came up with nothing. So, to me, it sounds like this job just spontaneously appeared for some odd reason.
Anyway, the later instances of the job # and the show were when it was sending time updates similar to the one I showed above, the actual start, end, and processing of the recording, and the instance when it was deleted by me after I discovered it.
Any ideas now that you all have a fuller picture of my situation? Anything else I can possibly supply to you all to help me troubleshoot this? Please let me know.