Originally Posted by
NA-Flyer
The funny thing is that the online system have quoted me different prices for the same itinerary

FWIW I booked two tickets out of KRT, one with the online tool while I was in Canada and one with AA by phone. The itineraries were almost the same and the ticket by phone priced in CAD turned out to be $1000 cheaper than the one booked online which was priced in USD, YMMV. It would appear that they were using different exchange rates for SDG.