i use biosculpture and i know that the two are fairly similar so this may help....
i often have the same problem with bio, esp when i first start a new pot (when white gel is quite runny, it seems to thicken up as it is used). so first off, i always make sure the gel is really well stirred.
i have also noticed that if the client takes theie hand out from under the lamp in the first 30sec-1min, the gel will start to ripple, even if it is put back under the lamp straightaway. soooo.... i think it may be something to do with the lamp / curing process... def worth ordering new bulbs.. change em, see if it's any better!
if it makes no difference, you havent really lost anything,, as you will neded to use the bulbs at some point i the future!
hth x