Struggled with this one for half a day yesterday. A client's PIN code when input into the Page Safe unlock screen should when one digit is input tab to the next digit. Yesterday I found that all digits were going into the first input box.
The day before I am convinced it was working properly so what had changed from Monday to Tuesday? I scrapped the site on the server and republished everything again. Still no joy. I remembered making some changes on the Siteground hosting pages which are new as of August 2019. So I tried to remember what I had changed and reversed the settings.
Current settings with Page Safe working are:
PHP - Managed 7.1.30
HTTPS Enforce - Off