Weird Kindle "Clippings" issue

So I have a Kindle - just a normal base one, nothing fancy - and you can highlight passages from books and it sticks them into a file on the Kindle called My Clippings.

It's pretty neat and I enjoy going in the file sometimes and seeing all the passages I've highlighted from different books. Recently, though, it's started filling it up with "empty" clippings. Basically whenever I bookmark something it creates an "empty" clipping. I think it may have to do with my phone (because I read my Kindle at home and then use the Kindle app to continue reading whilst at work) but I'm not 100% sure.

I'm guessing this is a long shot asking here, but has anyone else had this problem and/or know how to fix it?