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I've taken a look at your store and can see that you have set your product options to have a price modifier of "+C$10.00" for each sizing option. What this means is that each size option adds an extra $10 to the purchase price.
Please see the screenshot below:
Price modifiers are helpful if you want to charge extra for larger sizes. To remove the price modifier for a product log into My Yola > Online Store. Select the product you would like to edit and click "Options". You can simply add a zero value to each price modifier and then save the changes.