From the little i have to go on, i'm thinking you may be using two manipulate functions inside each other... Perhaps something like this:
Manipulate[
(*the first slider variable used here*)
Manipulate[
(*your code here including second slider variable*)
,
(*manipulation of the second slider variable*)
]
,
(*manipulation of first slider variable*)
]
to bring them both into one manipulat you can put a comma between maipulations, something like this:
Manipulate[
(*code, including first and second manipulateable variables*)
,
{manipulate first variable},
{manipulate second variable}
]
hope this helped, but next time please be clearer on what your problem is, and if there's no privacy concerns, post the problematic area's of your code! :