Hi Stachu
I am Dave, an Independent Advisor, I will help you with this . . .
This does seem to be a known bug in the Windows update settings page, though usually, your Windows 10 version is fully up to date and this problem is purely visual and resolves itself after a while .. .
Click your Start Button, type winver and hit Enter
On the resulting dialog, what Version No. and build No. of Windows 10 are you running?