Mast Cell and ST2 antibodies not working together for Flow Cytometry

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Gilligan
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Mast Cell and ST2 antibodies not working together for Flow Cytometry

I am trying to double stain for Mast cells and ST2 receptor to show the percent of Mast cells that have the ST2 receptor. 

The mast cell antibody works great by itself.  I usually see about 15% mast cells.  The ST2 receptor also works great by itself, with about 70% cells with ST2 receptor. 

HOWEVER, when I double stain them, the Mast cell antibody does not show up more than 2%.  It seems that the ST2 antibody is interfering with the mast cell antibody?

The ST2 antibody is made by Santa Cruz, (C-20).  It is goat polyclonal IGG

The mast cell antibody is BD pharmingen mouse anti rat clone ar32aa4

Why would these not work together ???