Shows “Noch nie” (english: never) for all users

Just installed the plugin. In the User list the collumn “Letzer login” (= last login) is shown, but it shows “Noch nie” (= never) for all users.

And yes I am sure that most users have logged in and I sure know about 2 users who have logged in today.

I have installed the following additinal plugins which deal with users:
UltimateMember, Learnpress, bbPress

The page I need help with: [log in to see the link]


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