help w/ leaves in paph

[ewbie]

hi! my paph looks like this last dec-feb



now, as summer approaches it was exposed to much stronger sunlight and the leaves underneath has turned yellow. i put it in a kind of terrarium to increase coolness as i read that spicerianum prefers cooler environment.



but after a week, these came out from the leaves:



does anyone know what is happening to my paph?

please help. thank you