This looks like a door construction problem, as opposed to a installation problem.
I suspect that the panels are slightly too wide and / or the groove is too shallow.
It will be easier to hand plane the edges of the panels to create more space in the groove.
I also see that the panels were not pre-stained before assembly.
It should be glued with UniBond-800 or epoxy, and then clamped.
If you need help with this you can PM me. I live in Meredith.
Regards,
Phil
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