Green mask on vga display on Apalis iMX6Q v2.6 Beta2 Image

We are using a multi display output setup with uboot parameters :

vidargs=mxc_hdmi.only_cea=1 video=mxcfb0:dev=hdmi, 640x480M@60,if=RGB24 video=mxcfb2:vdac,640x480M@60,if=RGB565 video=mxcfb1:off video=mxcfb3:off fbmem=32M

The problem we are facing is:
I ran gstreamer command:

gst-launch-1.0 videotestsrc ! imxv4l2sink device=/dev/video16 for hdmi and

gst-launch-1.0 videotestsrc ! imxv4l2sink device=/dev/video18 for vga

I have attached screenshots of both outputs. There is a green mask on video
displayed on vga.
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