I didn't meant to like a photo, is there anyway to remove the like?

There should be a number next to the heart showing number of likes, might take a Ctrl-F5 reload to make it show. Click the number and you get taken to a page where you can see the loves the item as received and there should be an "X" to let you remove yours. Except testing it just now, the X is missing, so wll flag this to MM as a possible bug.

Noticed the X is missing on likes of scenes too. I kind of use that as a wish list but haven't been able to unlike the ones I've bought.

i have had issues on and off getting the hearts to delete

Never know this was an option

There was a little bug preventing the red X from showing next to your love. It should be showing now but let me know if you don't see it

And we shall add an award for the "most un-loved" photo of the day...