Looping groove clips

I am using Cakewalk SONAR X3 Producer and am having the following problems.  I record a simple djembe line.  I then resize the data to only use the area of the line that I want to keep.  I then make a looping groove clip with this data.  I then stretch the clip so that it covers 12 bars.  When I play it back, extra notes are added to the sound clip.  Has anyone ever experienced this?  I got this idea from the "CreatingAnAudioLoop" video from Eli Krantzberg.  Thank you for your time.

Thank you for responding.  The beats are set to 4.  When I play the track without looping enabled, the 4 beat track plays fine.  When I Looping in Groove Clips, the track gets a little bit wider, an extra note is added at the beginning and the tempo is slowed down.  The piece is at 96 bpm, but when I select Looping, the original tempo field gets a value of 153.6, sounds slower and is not able to be updated.  Thank you for your time.
 

jvanbeek
One more thing.  I have, many times, restarted Cakewalk.  However, when I am re-starting now, I get the following message; "Transients are in the process of being generated.  Depending upon project settings, playback may be different until the process is complete."

I'm pretty sure that means that an edit filter was set to audio transients at some point or AudioSnap was selected, and it's still building tranients. Go into the Inspector for clips, select the AudioSnap tab, and disable it for any clips that have it enabled

Thank you so much for your quick responses.  I am going to try all that you suggest.  Again, I can't thank you enough.
 

I've tried your suggestions listed above, but with no luck.  I know this issue is hard to resolve without seeing the tracks first hand.  I am going to work with this without loops.  I'll copy the audio and paste it into a track for the number of times the loop would have gone.  I appreciate you trying to help, but I don't want to take up any more of your time.  If you do think of anything else, however, please post it and I will try.  Thank you.
 

You are exactly correct.  As I look more closely, I find that the tempo is not exactly precise.  I then imagine that when I convert to a groove clip, the fact that the timing is a little off throws the whole conversion.

jvanbeek
You are exactly correct.  As I look more closely, I find that the tempo is not exactly precise.  I then imagine that when I convert to a groove clip, the fact that the timing is a little off throws the whole conversion.

 
I doubt that's the problem. The whole point of a groove clip is that you can take something at one tempo and it will work fine in other tempos.
 
Can you post a screen shot of the loop construction window when you double-click on the clip? You can upload images at imgur.com and post a link here that will place the picture in the post.
 
I'm sure it's something simple. Please note that slowing down a Groove Clip will give MUCH worse results. I'm not sure what the original tempo was of the loop or of the project, but if you slow down a groove clip by more than 10% or so, you really have to know how to edit the clip to have it sound decent. On the other hand you can usually speed up by 100% or more. If I'm going to be creating a groove clip, I usually record at 80-100 BPM.