Why is my Add To Cart button not functioning properly?

[CityMountains]

Hi,

We added a slide cart app to our store a couple of weeks ago, everything seemed to work just fine but we've noticed today that our add to cart button started working intermittently.

Now it seems completely broken. I think the slide cart caused the issue because when you used to click the cart button the slide cart would open, now it goes to the old cart web page. Now when you click Add To Cart, nothing happens.

I've reached out to the app developer but heard nothing back yet, can anyone please help!?

Website: https://bit.ly/3gmm9W4

Thank you!