The trash cans are annoying, and seeing the deleted photo pop up again is confusing, but you're doing everything right.
This weirdness is caused a delay on our side and is nothing to worry about - sometimes our front end interface just takes a minute to catch up with the back end, behind-the-scenes processing that occurs when a photo is deleted.
A few things you can try...
First, refresh the browser window a couple of times.
Second, navigate to Memories. Find the refresh arrow next to the word Memories and click it to refresh the Memories page a few time.
Third, if neither of these works, just wait a couple of hours. Picturelife will catch up with your deleted photo and those trash cans will disappear on their own!