Voyager Reverting Database

I deployed my Laravel application with Voyager admin panel into Heroku. When I add/edit/delete any product from dashboard, every change reverts after approx 30minutes after the update. There are no error message shown anywhere in my application and everything https://walmartoneme.com seems to be working just fine. I want to control my data from admin panel in production server, but I cannot fix this issue after googling for a week. What could've gone wrong that caused this issue? Any suggestions?