Hello Olga,
I have newly purchased and installed xstore and wondering why mini-cart does not open by “add to Cart” some variable products. On your demo Page it works for variable products also:
https://xstore.8theme.com/demos/2/electron02/
Is there also installed a separate plugin?
For me it is not working neither for simple nor variables products. I see only Banner on top right that the product was added to cart.
Regards