No idea why that's happening, but you could try copying and pasting the tracks into a new project to see if that provides a remedy.
 
Scott

--
Scott R. Garrigus - http://www.garrigus.com
* Cakewalk SONAR Video Tutorials: https://www.youtube.com/u...gus?sub_confirmation=1
* Author of the Cakewalk Sonar and Sony Sound Forge Power book series: http://garrigus.com/?PowerBooks
* Publisher of the DigiFreq music recording newsletter: http://www.digifreq.com/
* Publisher of the NewTechReview consumer tech newsletter: http://www.newtechreview.com/