Gallery Image Links to attachment page

Hello Support-Team,
I’ve created a gallery where images don’t open in a lightbox but refer to an URL. That works without any problem.
I use a hover effect which shows only the description, this works fine, too.
The only issue is: when hovering over an image you will also see a kind of tool-tip “Open attachment page”.
This is not the case when hovering over images in galleries which open in a lightbox.
I am working on an artist’s website where this hint “Open attachment page” on every image the user selects is annoying.
Is there any possibility to supress the hint?
I tried by myself, but couldn’t find a solution.
Thanks in advance for your help!

Kind regards,
thedodora