[bug report] New index is created in a different position where it should be

[sergio-ortuno]

• My issue title starts with [bug report]
• I have read the README, especially the 'classic blunders' section, and the dragula docs.
• I have searched through the ng2-dragula issues for related problems, including closed issues.
• I have browsed through the issues labeled "future reference" for problems that have been solved before or have a known workaround.
• I am using the latest version of ng2-dragula.

Describe the bug (required)

I'm using the latest dragula version (2.1.1) and I'm having an issue when dragging and dropping an index.
For example, when I have two index, if I drag the second one on top but i don't drop it and then I drag it again to the original position and drop it, when I create a new index, this new index is created in the middle. If then I delete that index and then do the same with the first one but the other way around, the new index is created on top of every other index I have

To Reproduce (required)

Steps to reproduce the behavior:

1. Create two index
2. Drag the second one on top and don't drop it
3. Drag the second one back to its original position and drop it
4. Create a new index

Versions (required)

Please state which versions of the following packages you have installed:

• @angular/core: 13.3.9
• ng2-dragula: 2.1.1