On this question: What technical details should a programmer of a web application consider before making the site public?
Community effort questions banner is repeated.
Chrome: stable
Android: 5/6/7
Meta Stack Exchange is a question and answer site for meta-discussion of the Stack Exchange family of Q&A websites. It only takes a minute to sign up.
Sign up to join this communityOn this question: What technical details should a programmer of a web application consider before making the site public?
Community effort questions banner is repeated.
Chrome: stable
Android: 5/6/7
The question's timeline shows two users added the same notice on the same evening. So it's a data problem, not a UI problem. Here is an example from last year (with a different type of post notice); that seems to be have been a race condition.
There are 50 posts in the network which are affected by this, as this SEDE query shows. Most of them on Movies & TV. I presume the moderators can solve these instances by removing and reapplying the locks.
From the timeline of that post it becomes obvious that the notice was added twice: