Hi Steves_turn, I posted the thread here but no one replied. Since this place doesn't help I decided to close the topic. However there wasn't any button to delete the thread, which is why I declared "resolved".
My site looked really bad as there were circles, ovals and rectangles all over at the main page earlier. Since I got some temporary resolution and was able to make all the ovals and rectangles back to circles, no point leaving it as active topic. I didn't know closing down a thread which nobody replies to is "impolite".
For those who are having the same problem with me (circles became rectangles or ovals) it could be one of your plugins. Try to deactivate all plugins and see if the problem still occurs. Then try to activate your plugins one by one and find out the defect plugin.
Hope that helps.