Why Betfair Shows Different Odds Than Regular Bookmakers — Clear Guide for Irish Punters
https://trevormhzq705.theglensecret.com/how-international-bookmakers-are-messing-with-irish-punters-5-ways-to-fight-back
Short version: Betfair is an exchange where real people set prices by offering to back or lay, while bookmakers set prices as a house and embed a margin. That difference creates the odd-looking prices you see. But the story is messier than that