Two Identical Modules Behave Differently

Two Identical Modules Behave Differently

I have three modules that make up my home page: enktesis.com/
* The yellow bar
* and the two, 2 column grids

The first 2col module, (burgundy/gray) will stack correctly when moved to mobile resolution.

The second 2col module (blue/yellow) will always stay side-by-side even though it is set to stack.

You can see a video of the effect here:
drive.google.com/file/d/1WTdrhgT2itlazNK...hWd/view?usp=sharing

Any ideas?

Hi
please first disable and clear JCH, then tell me
you can not work with JCH enabled
CEd