Impossible to type 's' or 'p' in GitHub text zones

It seems that I am not the only one with this problem:

- https://twitter.com/FriendlyTester/status/909766104666529792

- https://twitter.com/_srph/status/909766541167562753

A friend recommends using a long s (ſ) until the problem is resolved. Refer to your operating system documentation to find out how to type it.

Did you contact github? https://github.com/contact

No problem here.