Unwanted actions with a touch screen

Hello,
I'm currently working on modernizing a machine for the high school where I work as a fabmanager.
I'd like to use a recovery touchscreen (an Elo Intellitouch 2700 maybe) with the Gmoccapy interface customized with a button for dust extraction.
During my first tests with a simulated machine, I'm having problems with the touch screen interactions, it tends to want to "deform" the interface.
I'm sorry, but I don't know whether this is a problem with Gmoccapy or the screen driver itself. I've tried a few things in libinput but to no avail.
I invite you to watch the video illustrating my remarks.

Video on my Nextcloud

What version do you use? Could you simulate this bug by mouse?

Sorry, I forgot to specify the version.
I use the official ISO with LinuxCNC 2.9.2 and Gmoccapy 3.4.6.

The problem doesn't really exist with the mouse. The mouse does allow you to resize the interface at this point, but only by placing the pointer precisely on the vertical separation bar.
The touch screen seems to do this even when using the jog or clean buttons in the preview.