Category diseapered

Hi all,

there is a problem on my website :
– all the category have disappeared from the category page
– I do not see the category when I try to modify the article
– Even some of my article disappeared (3 out of 6)
– Some of my article are uncategorized while some are not

I’m using wordpress 4.3.1 and version is The7.2 ver. 2.3.5.

Any solution for my problem ?

(sorry if there is some English mistakes)