Will have plenty of questions over the coming days / fair warning

So i put in a dynamic ping order for a buy at 0.00001326 sats but it actually brought at 0.00001386 sats, any ideas why it would purchase above the price i requested it to purchase at?
because it's dynamic : recalculation routine comes in play and order was recreated from 0.00001326 to 0.00001386
without any kind of price limits CAT is free to recreate a PING order in any market position.