I've tested on different Summaries component. One picture is a configurable app: Summary Viewer template (blue style layoute), it's work fine.
The other (orange layoute) is a Summary Widget under a web app builder (WAB), it's doubles or triples real results.
Both are working over the same map and the same layer. It is a feature layers from feature services, as Summary Widget documentation require but I can't get it work properly. I have tested in different WAB versión with same result (Arcgis Online, Arcgis for Developer 1.2 and Arcgis Portal 10.3.1).
Any ideas/suggestion to solve it?