It wasn't even on the respawn point, but in the treasure room.
Added after 8 minutes
In my opinion, the calculation using the formula is an error in the game...
I don't understand how they could rely on it if the probability of such a calculation is practically always incorrect!!!
The day of the week also has its influence!
You can test it by attacking some creatures on the seventh day and on the first. On the first day, there will already be more of them, not significantly, but more!!!