Please ,pitch prblem in sonar 8

The pitch change has nothing to do with 32- versus 16-bit audio, but rather the sample rate. What's happened is you recorded those files at 48KHz and now you're playing them back at 44.1KHz (or vice versa). Find out what the sample rate actually is - Windows will tell you that - and set your project sample rate to match. Alternatively, you can use a sample rate converter to resample the files to the desired rate.