Lesson 5, Chapter 14, Zombie ID Problem

[boraerinc]

When I click on a zombie :

Start to rename it:

And click enter, it modifies the previous zombie's name!

And before this, when I tried to rename the third zombie, it created a new one just before it (at index 3) and shifted up "NO NAME" by one. Has anyone bumped into this issue? Where can I go for the code responsible for this to leave a PR?

[boraerinc]

Same thing happened again on lesson 6, chapter 10: