[BUG] I can't use all features

[Kirin92]

Module Version: v0.3.17

Describe the bug
I can't use all features of the module. The only thing that works is to just mystify an item or replace with mystified. If I want to "mystify as..." I can't drop an other item into the drag and drop section. If I wanna "mystify (advanced)" I can't change if I want the current item icon or the mystified icon. other options aren't work as well.... It doesn't matter what I check or uncheck. It still shows everything but the name changes.

To Reproduce
Steps to reproduce the behavior:

1. Go to your items directory
2. Right-Click on "mystify as" or "mystify (advanced)
3. Try to change the Item

Expected behavior
A custom mystified item with my options enabled or image change

Screenshots
Sorry.... I can't show some screenshots...

Browser:
Chrome and Application

Foundry Version:
Foundry vtt 0.8.9

Game System:
DnD 5e