doubled closing X in full view

this X comes from your theme’s CSS file –
https://customer.vogeler-ag.de/kdawp/wp-content/themes/Impreza/css/style.min.css

So it’s not related to the plugin. It seems your theme also uses “Magnific PopUp JS” and has its own styles for it, including this X sign.

You can easily hide it by yourself with this CSS:

.amoteam-modal .mfp-container:after {
display: none !important;
}

(BTW, Not only this X sign is styled/added by your theme but other things related to member panel too.)

Hello Oleg,

thbaks – this helps!

best regards