Prinz zu Sayn-Wittgenstein's mysteries

[CJE]

Something puzzling about this well-known photograph.
It shows 29 "kills", 5 of them against Soviet planes.

But...
According to published lists of victories (Tony Wood), when he left the Western front, Sayn-W. had already 32 victories.
Why only 24 painted on the fin?

With two victories in the same night, he jumped from 4 to 6 victories on the Eastern front.
Why 5?

He reportedly bagged 7 kills in the night of 24/25 July 1943 (Obermaier says 20 July) but none of them appear in the same lists.

Thanks in advance.
Chris