line-through, text-align etc. not working out

When ever I try to use the visual-side editor I experience some glitches.

If I try to center something with the center button in visual, it will appear centered untill I publish or save it. Iit just doesn’t seem to recognize it anymore.

The same goes for line-through (strike-out), and the other left/right/justify align buttons. I do not use many other buttons, however, I am sure I could experience issues with them as well.

The HTML given apon centering is always <p style=”text-align: center;”></p>
This will then revert to <p style=”center;”></p> after I have saved/publish a post.
<p align=”center”> works, but damn is it time consuming screwing with this.

Then the strike-out is the same.
Starts out as <span style=”text-decoration: line-through;”> and then after save, I get <span style=”line-through;”> .

Ok, just wondering why the HTML is screwing up like this. I am a author of the blog, however it seems that I am the only one experiencing these problems.