without a url I cannot really say much other than

– sorting is working fine from what I can tell here (and has done for years)
– have you checked your custom groups ? (if any) if there are , have you checked those setting / can you provide screenshot ?
– Have you enabled debug (https://docs.wp-pizza.com/troubleshooting/)
and checked your debug.log ?
– Are all your plugins / themes up to date ?