ST_Contains Results in Incorrect Features

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I am using PostGIS to find the features that intersect between two layers. I am also using QGIS with the MMQGIS plugin to double check the intersection.

Here is the intersect that PostGIS is finding:

The Yellow layer is the bounding box. Postgis only returns the red feature, which is not even intersecting the bounding box...



The green layer is the (correct) intersect that MMQGIS is finding. I left the incorrect yellow feature in there for reference:



Which is what I was hoping to see from PostGIS. Any ideas what might explain this behavior? All layers are on SRS 4326.



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