Zoom effect with mouse hover in display media

[FrA1l3]

Hello team!
I have seen that I have a "problem" and that is that when you view the gallery on PC, when you see the photo in full size, if you hover the mouse over it it creates an unpleasant effect that I would like to disable. But I can't find what is the cause of the issue.
I leave you a video for you to see and the list of plugins that I have installed in this gallery.

I think the reason is stream plugin https://forum.coppermine-gallery.net/index.php/topic,80729.0.html because in the other gallery that I have installed on the same hosting, I do not have that plugin installed and the photos do not behave like that. They have no effect

Installed plugins:
(https://i.imgur.com/oTAeuTB.png)

Stream plugin options:
(https://i.imgur.com/D9WMS11.png)

Has anyone had the same problem?
thank you in advance

[FrA1l3]

I leave the solution in case it happens to someone else.

Ok, after several days of reviewing (sorry I don't program), I already identified why the gallery was doing that strange thing and it is not because of the plugin, but because of the option
"Insert a transparent overlay to minimize image theft"
https://coppermine-gallery.net/docs/curr/en/configuration.htm#admin_image_transparent_overlay_start

If you activate it, it does that strange effect with the plugin configuration. But when you deactivate it, absolutely nothing happens, so the mystery is solved.