Move Entry "Clearing One Doubt" to Vector Calc Category

[fluidistic]

I'm not able to move my entry "Clearing one doubt I had/have" into the category "Vector calculus" that I just created. This entry appears in the "Uncategorized" category.
I've clicked on almost all I could, with no success. Does anyone have an idea?

 

[Redbelly98]

It's a bug, which I think started happening last fall. We used to be able to categorize blog entries before that. Not sure why.

 

[fluidistic]

Ah ok, thank you.