I’m experiencing an issue with variable products on my website.

Hello

I create a variable product and assign a custom attribute, such as Size.
I then generate variations based on this attribute, set prices for each variation, and select a default variation.
However, when viewing the product on the front end, the default variation does not seem to be pre-selected. Instead, I see a message prompting me to select a size, preventing customers from adding the product to the cart without manually choosing a size.
I verified that the default variation is selected in the product settings.
Could you please advise on how to resolve this or if there’s any theme-specific setting that I might have missed?

Thank you