Clouds only visible from 1700 or less below?

Hi,i have a anomaly in my clouds, at least with the lower ones of multiple layers.Every cloud layer (possibly except the top layer) get visible if i am 1700ft below the clouds base (or if a am higher than 1700ft below cloud base), and gets invisible again if i descent to an altitude lower then 1700ft below clouds base.I feeling a little bit ????????? now.I have FS2002 Pro and FSUIPC 2.95.