Problem with multiple payment methods

-- url of the page with the problem -- : http:///www.lienocka.sk
-- HikaShop version -- : 2.2.1
-- Joomla version -- : 2.5.14

Hello, I am experiencing problem regarding multiple payment methods. Let's say I had 2 payment methods (1. collect on delivery payment plugin AND 2. bank transfer payment plugin). After few months I decided to add another payment method (3. bank transfer payment plugin). Now all my old orders in history with method number 2 changed to method number 3.
The problem is connected also to new orders. If customer uses method 2, I can see in my backend - in orders summary method 3.
Is it some sort of bug or what can I do to correct this? Thank you.

Hi Jerome,

please look at the attached screenshots:

- hika_methods: list of payment methods (2x collect on delivery with different pricing, 2x bank transfer with different pricing, 1x bank transfer with special pickup place

- hika_orders: list of recent orders.....most of them has displayed wrong payment method


- hika_order_g1j46: order details with correct payment method (see the difference between previous screenshot and this one)



Regarding the HikaShop version: I would like to do the update, but I am really affraid that something go wrong and change the existing settings, or corrupt something.......is the update procedure really safe? Do I need to do some changes again after the update?
Thank you.