Mobile size enlarges with "Select Option button is clicked."

Site URL: https://flanboyan.com

Hello, 

I created an online store in the Clay(Brine Family) template. The problem I have is with my mobile display. Everything is great when you click on a product until you click on a size option or quantity. The screen immediately zooms in and enlarges the view. I have to pinch the screen to make it the size of my phone again. I have tried everything to fix this problem. Please help. 

Have you solved it yet? If no, can you share link to a product? We can check easier.

Hello, 

Thanks for answering. This is the link for the vanilla flan. https://flanboyan.com/shopflan/vanilla-flan. The problem I'm having is on mobile. Every time I click on select size option. It zooms really big.