It’s a click bait trap
It’s a click bait trap. They get you to “purchase” your tickets at the low prices you see then you get an email saying you need to call them to finalize your purchase. At this point, they inform you your flight cost (magically) will be much more due to “unavailability” of the airline seats you selected. I’m only giving 1 star because at least the guy I spoke with was a little professional.