"Reorder Service Item" does not manage two instances of the same image

Hello,

1) Start OpenLP
2) Open the attached service file.
3) Right click the service item and select "Reorder Item"

Now you will have a list like:
1.jpg
2.jpg
3.jpg
1.jpg

Now either do 4.1) or 4.2)

4.1) Select the last item and click the up arrow.

Result:
The first item (which has the same name as the selected one) moves from the top to end of the list (actually it is the last before the last). Anyway, the list looks like this:
2.jpg
3.jpg
1.jpg
1.jpg

4.2) Select the last item and delete it from the list

Result:
The first item (which as the same name as the selected one) is deleted from the list.

Expected:
The action should be performed on the selected item. Duplicate images should not "confuse".