bizarre behaviour

[anacreon]

For the last few days, one of my shelves has behaved strangely: one of the epubs appears once with its cover but with "read now" instead of %read, type (epub) and size, and at the end of the list with no cover, title but "author unknown", and "buy".

If I click on "buy" it says wifi not connected, if I click on the cover, it says "unable to find a reader for this type of content", but if I click on the epub with cover, it opens on the right page (one is already 83% read), and next time I go to the shelf, another book behaves like this, just one, and it seems a new one everytime.

Did it happen to anybody else? It does not prevent reading, but I don't understand why or how and I'm curious.

It is one of two shelves for active, or soon active lists, limited to max 24 books, and where books come and go very often as I finish or drop them or decide to read/try one now or sometime soon. The other doesn't have this problem.