- have you checked the record of IP addresses your account has logged in from to check no-one's hacked your account? My Account -> My Betfair Account -> My Details ->Security Details - it isn't anything obvious like they're bets placed by BF's Cash Out button
(I'll assume you haven't let your iPad to your toddler...)
If you haven't already, enable 2FA so no-one but you can log into your account.
Two thoughts:- have you checked the record of IP addresses your account has logged in from to check no-one's hacked your account? My Account -> My Betfair Account -> My Details ->Security Details- it isn't anything obvious like they're bets placed by