No choices when i select a child product

[csho]

I have the following problem:
After choosing one of the child products from child variant option when i view the parent, the selected product is the only option in the child variant option.
I have to page back in order to reselect my child products.

I have checked Parent Orderable (which i want) and Display parent as option (which i also want).

In my child products I have check overwrite plugin something box in order to have different related products for each variant.

Also Showing Product Sku,Weight etc doesn't work, it always shows product name as an option.

I hope this helps to find out what is wrong.
Thanks in advance.