How the heck ASDR is slightly increasing?
Part of the difference of 2 kt between the two V1s may be due to rounding the speeds to a full knot. The more extended flap setting may also give slightly higher drag during acceleration and less weight on wheels hence less braking effectivity during the stopping part of the accelerate-stop.
The TODR with flaps 15 is less than with flaps 5 (assuming equal V1,s) because V2 is less. That doesn't exclude somewhat higher drag during acceleration.