SYMPTOM:
In Strategy 10.x, the 15th digit of the metric value is rounded differently between Web and Developer, as shown in the image below:
Developer:

9.43604865462587%

9.43604865462588%
Max(ApplySimple("2560.000000 / 27130.000000", 0)) {~}

CAUSE:
This is a known issue with Strategy Developer 10.x
ACTION:
Strategy will continue to investigate and post updates as soon as they are available.