Henley Apollo Door Not Sealing Tight

Hi all,

Anyone experience this. I thought nothing of it over last few days but this evening I notice that as is, a lot of air is getting causing almost an inferno inside as if I had both dampers open.
The door is closed but if I push it a little, it seals it like it did when it was new (2 years ago) and the flames stop dancing and kind of gently move, as one would expect with dampers closed.

I will contact Henley Monday but any early suggestions what it is?

Thanks