we have trouble with our civicrm contribution page since we updated to 5.16.3 (running in wordpress 5.2.4):
the contributions page was running fine with paypal standard and a pay later option in the same wordpress with an outdated civi. After the update we suddenly have the following issue:
1. after filling in the profile and amount (and i have built a new profile to include as well as a complete new contributions page to check if the trouble was with this part of the page - which it wasn't) i check "PayPal" and confirm my contribution -> i am thrown to the same form again (without the fields filled in) but the URL is ?page=CiviCRM&q=civicrm/contribute/transact&qf_Confirm_display=true&qfKey=......
2. after filling in the profile and amount and using "pay later" before clicking on "confirm" the form suddenly doubles - with all the text and fields which the original form has...I then cannot click "confirm", or if I fill out everything (double) it just throws me back at the same page.
3. my Console gives me "Uncaught SyntaxError: Unexpected token '<' with the page /?page=CiviCRM&q=civicrm%2Fajax%2Fl10n-js%2Fen_US&cid=13&r=QZKnC (when checking this question this doesn't really describe the issue, as it is the same for logged-in and logged-out users....doesn't make a difference for me) we manually changed languages with this civi installation, as I feared it might be the German language files which cause this issue, but the en_US files produce the same issue...
The Site we are talking about (our beta-test site) is: https://ls-beta.de/spenden
-> anyone any ideas what the problem could be? -> help is deeply appreciated