Aggregation works fine with summery as long as the time line is under 2 days.
When you zoom out the sum function will misbehave.

Picture z1.JPG = show my Widget with aggregation and Sum.
Picture z2.JPG = show 1 day of the summery and its correct.
Picture z3-2days.JPG = show 2 days of the summery and its correct
Picture z4-3days.JPG = show when the summery goes very wrong.

Steps to reproduce:

1. Any data set with aggregation with summery will summery items wrong when zoom out over 2 days. (settings as on picture z1.JPG)

Result:
See screenshots

Expected:
Correct summery regardless what time line setting I have.