Different Behavior Build in DB and PostgresDB

I hosted my app on a Docker container with a PostgresSQL database. However, while testing, I noticed that the program logic behaves completely different than when I run the app locally. Has anyone had this problem before? So functions that write and retrieve data to the DB no longer work correctly.      
1 answers

The built in database is only recommended for quick demo’s and proof of concepts, but in all other cases a db like Postgres or MSSQL is the way to go.