Blix – sidebar disappear suddenly

Hi,

I use the Blix theme. Today after I rearranged my categories and added in a new post, the sidebar disappeared all of a sudden. The background also disappeared. When I clicked on some old posts, some menus on the sidebar appeared again (but not some other). I dont know what happened, I did not touch the theme editor, just rearranged the categories!

Here’s how it looks like right now: https://nguyenthuy.net/myblog.

Please help! I have a feeling that this theme is kind of unstable. I had this format change problem before when creating a new post (again, without touching the theme editor!).

Thanks,

Twee