Why I see sometimes some questions with shadows or in background like the picture in attachment?

My question, following my comment, refers to the fact that I do not have any Ignored tags and, for example, permutations and combinations they are not into favoritied tags and into ignored tags, like this image:

Updating: I don't know if it's the same problem as before but I see the answer shaded.

• Likely it is because you ignore a tag; that sometimes even happens inadvertently.
– quid Mod
Jul 1 '20 at 12:34
• @quid Thank you very much for your reply. I have only 9 Watched Tags and for example I have ignored permutations and combinations...but I see normally the question. Jul 1 '20 at 12:36
• @quid Just I have improved my question and I think that it is not a duplicate. Jul 1 '20 at 15:31
• I reopened as the answer does not appear to be clear inded;
– quid Mod
Jul 1 '20 at 15:42
• @quid Thank you very much Sir. Jul 1 '20 at 16:21
• No problem for reference I'll add the link which was autodeleted in the process math.meta.stackexchange.com/questions/3854/…
– quid Mod
Jul 1 '20 at 16:29
• Just to make sure, can you check the tag preferences in the settings? Jul 2 '20 at 5:27
• @AndrewT. Surely, now I edit my question with a screenshot. Thank you very much. Jul 2 '20 at 10:18