Are we discussing two or four attempted transactions?
If there were only two and those were marked as "unexpectedly declined" then the "offer declined" messages probably mean that the seller does not want to sell to you (or just as likely , to Canada) and there should be no completed transaction on your Paypal account.
If there are four different declined transactions, first look at the expiry date on the credit card you use to back your PP account. That can be an overlooked reason for a decline.