Configuring character slots bug

Let's say I have something like
(slot - character)
1 - Alpha
2 - Beta
3 - Gamma
4 - Delta
5 - Epsilon

and when I drop Epsilon on slot 3, slot 5 supposed to be cleared, right? Not always:
1 - Alpha
2 - Beta
3 - Epsilon
4 - Delta
5 - Epsilon

okay, let's drop Delta to slot 2 and Zetta to slot 5, just to clear up confusion:
1 - Alpha
2 - Delta
3 - Epsilon
4 -
5 - Zetta

and then Mu to 4:
1 - Alpha
2 - Delta
3 - Epsilon
4 - Mu
5 - Zetta

and then Omicron to slot 2:
1 - Alpha
2 - Omicron
3 - Epsilon
4 -
5 - Zetta

4th slot is cleared because, it seems, there WAS Delta some time ago.


ISBoxer version 40.3.0626.2

[Alge]

For those playing at home, this issue was fixed in ISBoxer 40.3.0716.1.

If you need to update, choose Help, About ISBoxer Toolkit from the ISBoxer menu.