Product Bug: Variant Selection not working

[mckennahurcomb]

When you select any size and then add to cart then the cart automatically shows the first default product instead of what the customer selected. Help... how do I fix this?

Example: I wanted a large dog harness so I select large and add to cart. In my cart it shows I selected small when I selected large.

[Guleria · Accepted solution]

Hello @mckennahurcomb ,

It happens because of a JS conflict. And conflict comes when you install/uninstall apps or add custom JS code or by mistake remove any code. 
To fix it: 
1) Try to revert the changes you did recently.
2) Try to find the conflict and fix it. You can check the conflict in browser console.

Thanks  

[mckennahurcomb]

What should I do if an app service provider made the addition for me and I am unsure of what JS they changed?

[mckennahurcomb]

What should I do if an app service provider made the addition for me and I am unsure of what JS they changed?

[Guleria]

Let them know about the issue which you are facing after they made customization in your store.