Big Problem? Could you fix it? Attribute Group Problems with CSV Importing!!

[Killer]

Hi, i want to import products attributes, but there are some problems ( A big Bug?)
I When i import csv, the attributes can be added to the products, but there is a problem, when i import one time, that will create new attributes which i added in the csv to the back office, even though they are already there before i import csv.

For example,

I am going to use the default Color group ,but when i import one time, prestashop will add another Color group in the Attributes and Group!! It does not use the default Color group! Why?

If I import N products, it will creat N Color group attributes!! That’s a bug, right?
any one can help me to fix it out. Here is the content of my test.cvs. thank you very much.

test.csv

id_product;options;quantity;weight;price;default
1;Color:Black;1;1000;10;1
1;Color:Blue;1;1000;10;1
1;Color:Yellow;1;1000;10;1

[Killer]

I don't know how to fix the bug. Maybe you can help me . thanks