problems with all orchids... :S

[orchid maniac]

Hi! I am growing most of my orchids in shadehouse during summer. The problems are constant, and there are only a few species that are not concerned... For example phals grown there grow smaller leaves, miltoniopsis and related genera don't grow well at all, two of them snarled their leaves inwards and flopped their flowers, oncidium has some kind of peloric flowers... A few first flowers opened and were looking ok, but the rest of them are somehow undeveloped, and don't have labellum at all... Why is that??? what am I doing wrong? Orchids like paphs, cymbs, dens, cattleyas, laelias and vandas are growing ok, and flowering ok as well... I am a bit confused!