duplicate background layers

[sjordi]

Hi,
for an unknown reason, I have duplicate background pages on my website file.
The classic ones, Page Background and Pasteboard Background
Now, there are two copies on top of them "Page Background (2)" and "Pasteboard Background (2)"



How can I get rid off them without suppressing everything. They seem to be linked but I don't know how to unlink them.
If I open the "Page Background (2)" layer and suppress all included elements, they disappear, but when I suppress the last one, it entirely suppresses the original "Page Background" itself.
Same for Pasteboard Background.
If I delete "Page Background (2)" it suppresses the original Page Background as well.

Am I missing something? For now I just hide the two copies, but this is not something I want to keep...

Thanks for any help.