fly.qux.us/smcalc/ - It won't calculate anything, not even the example provided (jfk-atl-sfo-atl-jfk).

I've used Safari, Chrome, and Firefox which are all updated on my MacOS. I don't know who to reach out so thought I post this here and see if any fix or see others experiencing same issues...
I noticed it stopped working around late February? It was definitely working January this year...

*link won't work because I don't have enough posts for this forum.