EGPFlyer is correct. The speeds you get displayed are Ind Air Speeds which are calculated for the out coming FLEX Temp. If you use these speeds now at a lower temperature than FLEX, which is the case as your OAT is lower than FLEX, than the resulting TAS will be lower.
E.G.: Your program assumes a TAS at V1 of 135. But your actual TAS at V1 will be only 130 due to operating in a lower temperature environment than assumed in the program. As you abort Take Off at a lower speed than calculated, you will have an additional stop margin.