flask_heroku | An easy-to-use Flask template for Heroku | Style Language library

I recently tried deploying my Flask application to Heroku and have been running into a few issues. When testing the application locally I have no issues w/ the app at all. Everything like the user registration/login works perfectly and item form submission works perfectly.

However when I visit the app at https://simplify-exp.herokuapp.com I get weird issues when doing any task related to form submission (user login/registration and item creation). When something is submitted the webpage seems to do nothing but the third or fourth time I hit the submit button it works fine. Form submission seems to only work half the time and I have no idea why. There is just erratic behavior when any for is submitted regarding redirecting.

Here is an example of the login not working properly. It works perfectly locally.

https://streamable.com/ywsj2

Here is an example of logging out going back to the login page when it should go to the main page w/ the sign up and login buttons (the one w/ the blue background).

https://streamable.com/iblv6

If you visit the site and use it for a few minutes then you will see the issues.

Included below is part of the code and the heroku logs. Any help would be appreciated.

I tried redeploying the app and restarted the db connection as I thought that was my initial mistake. Tried googling the error but found nothing.