There are multiple ways to delete items from a Watch List -- try another method.
You should be able to delete most items from the item page directly, except for variation listings that are out of stock.
If an item is out of stock, you should still be able to delete it directly from the Watch List page.
If you are using a desktop browser, go to your Watch List or Summary page, select the checkbox to the left of the item on the list, and then use the delete button at the top of the page.
If you are using the eBay app, from Watching, hit the "edit" menu to reveal checkboxes, select the box by the item, then tap the trash icon at the top of the page.
If none of that works, try using another browser. Or try going to ebay.ca and deleting items from your Watch List there.
