I think I know the problem - I fixed an issue with the settings import a week ago but piefed.ca hasn't updated to the latest version yet.
If you're not committed to piefed.ca then check the footer of any other instance. You want it to say PieFed v1.1.0 instead of PieFed v1.0.x. piefed.zip, feddit.online, quokk.au and piefed.social are all on 1.1.