Something crazy happened

The story begins the day i converted all my 30 characters to rotw. In the process, one of my mules was lost. So i had to create a new character. Afterward my total of characters was 30. The maximum.

Today, as i was moving stuff from my stash to my mules, something crazy happened. On the character screen, my lost mules suddenly re appeared in the selection. Still in d2r version, i can convert her to rotw.

So now i have 31 characters total, i triple checked it. But idk what i should do really. I fear that this mule share some variables with my other characters. What happens if i delete that mule, would an other character sharing the same variables(slot number) be erased too?

The only thing i did different today, was to select some mules, and start a new game in normal mode, nm and hell in order to imbue some diadems. I dont see any reasons why that mule reapeared.