Recording plays back early when using Input Monitoring

If you're getting latency with input monitoring, and you haven't increased your ASIO buffer, it sounds like you've added some plugin that has an internal 'lookahead' buffer. This triggers SONAR to apply Plugin Delay Compensation to all the other tracks so that they playback in sync with the delayed track. By default this delay will also affect input-monitored tracks.
 
SONAR corrects for this added latency when applying record compensation to recorded tracks. But if you're used to playing with some monitoring latency, you're probably already playing ahead of the beat to get your real-time performance sounding in sync with t e playback. So your new track is ending up over-compensated.
 
If the plugin inducing the delay isn't on the track you're recording (e.g. an amp sim) , you can click the PDC [Bypass] button in the Mix Module to bypass PDC on input monitored track. This way you won't have to deal with the PDC while recording, and SONAR's record compensation should take care of the normal input latency. Switch it off when you're done recording, and the new track will playback in sync with everything else.
 
Ideally, you'll want to avoid having PDC-inducing plugins in a project before you're done tracking. Some common offenders are convolution reverbs, Cakewalk's Linear Phase plugins and Transient Shaper, and the aforementioned amp sims.