Items cannot be deleted from watchlist/ list

There are a couple of items in my watchlist and another couple in one of my lists than I am unable to remove. When i try and remove from the lists i get the following message in white text within a red box:  "Failed to remove items. Please try again". 

I tried clearing the app's cache and re-installing the app, with no success, I also tried on my laptop using both mozilla firefox and chrome.

I can add and remove other items and add notes, its just these 4 items that seem to be stuck and i cannot remove.