Name of author and date on a mobile

Hello Yannick,
Thanks for this very interesting (en free) Link library plugin. I’m testing the plugin on a website, and I believe I have seen a bug.
I use the same template on many websites for years (MyKnowledgeBase), and the css lines below worked well on a PC screen and on mobiles:

.postmetadata {
display: none;
}

But when I use your plugin, the name of the author and the date disappear on a big screen but they appear on mobile pages…
I tried to erase cache on the mobile and on other plugins (WP-Optimize) but “admin” and the date appear again.
What do you think of that ?
Thanks again
Michel