Login issues + sending of emails

Hi, I bought the Tracker and installed it 4 days ago. It has a few problems and I will list it here. Maybe we can do a screenshare when you are available? I live in Norway and my timezone is GMT+2;
1) Number one is that I have difficulty logging in, it seems to work only every second time. Chrome browser on Windows11. Same thing with Edge, but that’s basically Chrome too, I think. If I log out from my admin account, delete all browser history & settings, I still have trouble and I get the “you have already applied for this”-message – even when I am trying to test applying with a dummy user with a separate account.
2) I have set up a new application status called “Send rejection letter”, created the corresponding email text in settings – and when I filter all applications, select them and bulk change them to this status, I got maybe 40 copies of the letter to my inbox, but not the around 200 I expected. So now I do not now if the emails were sent OK – or not. Also: Does the Tracker send emails to the email address the user registered with in WordPress, or does it use the email the applicant entered in the form ? How can I verify/keep track of how the sending of letters were successful – do I need a third party plugin (I know they exist). What are the sending limits (max number of eeails the Tracker will send in one operation) , and can I choose to send for instance 50 each hour to not upset the mail servers ? If you have documentation I would love a copy..
3) The email topic of emails is in English, how can I translate this ?
4) When I log in as a applicant, and view my application and click on the attachment – it does not show up, instead I get redirected to this page:?https://next1.no/?attachment_id=18. This same page was also served just now when I clicked on “get new password” from the login. What is happening, and how to fix.

The page I need help with: [log in to see the link]