Flip Everything stopped flipping back

I am using Flip Everything on a webs0te I am developping now.

It is set to overlay on click.

Initially one click showed “back”, and the second click hid it.

At a certain moment I noticed that the second click does nothing and “back” stays there forever.

At first I thought that some my JS caused it. I used my pure website to try it. I had old bricksforge there, and FlipEverything worked as expected. Then I upgraded to last version (3.1.1.1) and the bug is there.

Here is the video. https://youtu.be/zJE2iFNJ6rA

It would be good to fix it quickly.

UPDATE 26.07- it also does not flip when using keyboard only.
Currently I have Bricks 2 and latest BF version.