Thread:Project:Support desk/Html tags not working

Hello, some of the tags in my wiki doesnt work.

for example works but  doesnt work

also when i create table the wiki doesnt recognizes tags.

http://prntscr.com/4z78cr

There are some other tags like this which wiki doesnt recognize. What could be the reason for this?

http://www.nebula.web.tr/wiki/index.php?title=Ana_Sayfa