Why does my refund decrease when I enter interest paid in 2018 on my student loan on line 319?, why this happens?

I have tax payable but the refund goes down when I enter the 2018 student loan interest

Troubleshooting

Issues such as this are difficult to diagnose in our forum. Please contact our phone support team for assistance.

Here's how:

https://turbotax.community.intuit.ca/replies/3152013