Hi @dominiks8318, thank you for the update. Actually we have written our code so that even the smallest Javascript or CSS file gets loaded only when necessary instead of loading all files together to improve performance and speed.
The error you have reported seems to be related with a PHP version. Could you please take a look and share what PHP version you are currently running on your store?
Hmm, usually there is an edit link next to the review either right below your review or on the right sidebar. Then you may be able to edit it also under your account and left Review section.