Overlaping graphics not vissible in featureLayer

[ManojrajTeli]

I have constructed featureCollection from Json and feature collection has 44 features. I have given this feature collection as input to the Featurelayer which is showing only 32 graphics objects of the featurecollection.I found out that overlapping features are not rendered at all in the feature layer. How could I resolve this issue and what is the possible solution to this problem.? Thank you in advance. Thank you in advance.

[derekswingley1]

Can you post a copy of the JSON to reproduce this?

[ManojrajTeli]

My bad "esriFieldTypeOID"(Treating as primary key) had duplicate values which where overlapping so even though I was able to see those records in feature collection it was not seen as geometry for the feature layer. I changes one one of the record then geometries where overlapping fine .Thanks for the comments @Derek Swingley.:o