Sub categories shown in product page

[izig]

The subject is only partially correct.
I have strange behavior in a few pages. Here are some examples:
The following link to a product shows on the bottom the sub categories of the category of the product is part of:
http://www.yonishobby.co.il/%D7%98%D7%99%D7%A1%D7%A0%D7%99%D7%9D/%D7%9E%D7%91%D7%A6%D7%A2-%D7%98%D7%99%D7%A1%D7%9F-%D7%98%D7%A8%D7%99%D7%99%D7%A0%D7%A8-%D7%A9%D7%9C%D7%98-%D7%A8%D7%97%D7%95%D7%A7-RC-shop

In the following link to a Category, I used to show the sub categories. Once removed them, the text from the VirtueMart category description shows twice:
http://www.yonishobby.co.il/%D7%98%D7%99%D7%A1%D7%A0%D7%99%D7%9D

Here is another example of the issue described above:
http://www.yonishobby.co.il/%D7%9E%D7%A1%D7%95%D7%A7%D7%99%D7%9D

I, probably do something in the wrong way. to show / hide the sub categories from a parent category I use the "Main menu" entry pointing to the relevant category.
Should I do it from a different location? I would like to hide all sub categories and to add text to each category.

Thanks,
Izi