Content Tree repeating itself

[magicalwonders]

Not sure what I've done to cause this issue. One moment everything's fine, the next moment my content tree is looking a bit weird.

I've just got the Actinic default store showing at present, but for some reason
"Home" "Catalogue" and "Basic Products" now have the html file name showing in brackets after each listing!

I've attached a jpeg so you can see this in action.

Can anyone tell me how to switch this off and revert to the way it should be?

Thanks

Myles

[magicalwonders]

Didn't take the photo. Trying again!

[magicalwonders]

Ooops, Found it.

I'd ticked "show page names when editing Catalog"!