[TYPO3-shop] Sorting products little weird

[Rolf Spall]

He there,
 
I wanted to order my products by price. So i added the following code to the SETUP:  plugin.tt_products.conf.tt_products.LIST.orderBy = price ASC
It works but when i have the following prices: 3.00, 5.00, 10.00, 15.00, 25.00. Then it will be viewed in this way?
 
10.00
15.00
25.00
3.00
5.00
 
is this changeble?
 
Gr
Rolf
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