This rust type thing is attacking my Paphs. Am growing them in an east window and 2 have been affected so far. Paph Saiun (Wardii 'Green Aura' x Sukhakulii 'Flashdance') and Paph Kolopakingii x Paph Rothschildianum 'Charles E.' ® Bel Royal.
No signs of any insect including spider mite present. Any help would be appreciated.

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