My free bet on Betfred and Betfair has just settled. The offer on PA was bet £10 get £30 free bet. I worked out on the calculator that if betfred win i make £20.59 if betfair win its £20.60!!!.....

So just checked my Betfair account and ive got the £21.69 lay stake back.....so im just wondering why i didnt get back £20.60 (the amount on the calculator)......I bet on the draw by the way.....

i just cant quite get my head around this, can someone please through some light?......

Many thanks