Problem in topic icons

Please I have a problem in "extended message editior" and the WYSIWYG mod ..
The icons of topic ( B, U , center , Left, font ,...) as u see in image I attached to this post are not well arranged and they are not next to each other but they are overlapping each other.

..I tried to change them through adminstration panel > general > message and emails >configuration...but every time I change them..after while it returns again overlapped icons.

Can you please help me???

u might be browsing your forum from google chrome..try your forum at internet explorer or firefox it will not give problem

thanks