Messed up on mobile

As you can see on mentioned link or the screen videos, on the mobile version the touch event only works correctly on the first element in the row.

https://app.screencast.com/7nmuxQMI4MMlO (mobile)

https://app.screencast.com/ZPfOjf1jKSJvO (Desktop)

1st problem: there is no second touch that turns the flipbox back and shows the front again.

2nd problem: from the second element in the row, the back side of the flipbox is wrongly positioned above the previous element.

Any hints how to solve this?

The page I need help with: [log in to see the link]