Very intentional.
Betfair isn't a traditional bookmaker for sports betting.
It's what's called a 'betting exchange' where you are backing/laying against other people in the market, while the match is in-play.
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I see some of the convo during ball games where the odds for team A to win is +275 when it opened lower. And people can bet later in the game (I presume) taking on longer odds.