Debut theme Add to cart issue. Adding 2 incorrect product variants

When selecting Size and Swatch color option in product page — clicking add to cart would result in 2 different variants of the product being added to the cart.

First product is — chooses incorrect first option size, and then the correct color.

Second product is — chooses correct size, incorrect color

Sometimes it’s stuck in add to cart button loading…

I think it’s variant issue.

please help!! I’m losing sales. 4 Customer made aware of this.

Link of issue:

https://otusk.com/products/copy-of-100-cotton-bedsheets-u-s-polo-assn?_pos=3&_psq=polo&_ss=e&_v=1.0

Help. Please developers