no checkbox will be displayed

We do not add any styling whatsoever. This is an issue with your theme. Please enable it and show me the exact page so I can take a look for you.

Hello,

here in this post you can see it, actually up-to-date with all posts ??

https://schnittchenswelt.de/2018/05/aktionsmonat-sewera-bei-schnittverhext.html

Your theme is adding very weird styling to all your checkboxes: https://imgur.com/a/Acl6oQU

Remove these to show the checkbox correctly. Contact your theme developer if you need any assistance.

thanks for your help,

i must add following code and now all works fine

.wpgdprc-checkbox input {
width: auto !important;
display: inline-block;
height: auto !important;
margin-right: 5px;
-webkit-appearance: checkbox !important;
}