@Tahr, It is a few years since I was installing Log burners. Looking at yours and not being able to tell exactly the distances from a photo, it does look a bit close to a combustible surface - that being the ply. For an unshielded fire like a Pot belly the offset is something like 90cm.
As your flue is unshielded ( no reflector ) the ply behind it is likely hotter than is safe. Wood will get dryer and dryer until a point where it combusts easily. From memory the surface cannot exceed 90 degrees, but I think that is of a non combustible surface.
A simple and tidy solution is to run a couple of sheets of baby iron up the two walls behind mounted on Rondo battens with airflow allowed by gapping the iron off the floor and leaving a gap at the top. My guess is that a camping type burner like that doesnt come with an install spec ?
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