yeah man, the larger discolored one needs better lighting and pics.atleast two or three even. but the smaller is a heat and lack of calmag potentially and totally a starter feed also. the second set of leaves are fully developed yet kept small due to the extreme heat you said you had right?(well maybe not extreme but higher temps sustained will do it) Ive had that a few times.but that cal mag and a small starter feed and cooloer temp with low air exchange is that ones issue and the heat is yanking the foods out of the soil so thats why its sooo damned tiny yet a miniature developed set of leaves,meaning its time for a small fee.or starter dose.but I dont do chems,i'll defer to these guys.but the other I couldnt tell you without better pics.
thats my opinion as of right now with that little yellow one