I just tried half a dozen and it works fine for me. OK I missed 5 out of 6 so maybe "fine" was the wrong word.... Maybe try another rating range? Maybe for some reason it doesn't like a lower rating range of 1? Mine was set for 1200 to 2000. And of course whenever things go haywire it's a good idea to clear your browser cache. Good luck!
The "Puzzles I Have Failed" option doesn't work for me

I changed the rating range and cleared the cache but it still didn't work, unfortunately. I also made another account and failed some puzzles on it, to see if this account was somehow bugged but I got the same error on the other account as well. I tried it on another browser and still got the same error. Out of ideas on why this would be happening.
Every time I try to use the "Puzzles I Have Failed" option, I always get the message "No puzzles found. Please select new themes or adjust the rating range to get more results." Here's a screenshot of it - https://i.imgur.com/tysPmWM.jpg