Anton: With the extreme heat you've been having, maybe your phal. is stressed. These are a couple of my phals. on the west windowsill. No bottom droopy leaves, however, the upper leaves are quite a bit larger and they definitely are drooping. They're all quite healthy and in bud or bloom. Perhaps it's their genetics. If it's something else, it doesn't bother me as long as they're healthy. (P.S. yes, that's still snow out the window!)
I've attached in interesting article regarding droopy leaves on phals. Once you get there, just scroll down to the answer section.
http://en.allexperts.com/q/Orchids-7...ing-leaves.htm