V-Vocal stopped processing at previous punch in point

I used the Punch Recording module in X1 to re-record part of a vocal track.  Then I applied V-Vocal to the track.  But when it got to the first Punch-in point I had previously set to do the Punch recording, it stopped processing the track.
 
Why would this happen?  Was there something else I was supposed to do before using V-Vocal on the track?  I notice that there are vertical lines at the Punch-in and Punch-out points that I had designated.
Do I need to apply V-Vocal mutiple times if there are former punch points showing in the track?
 
What to do?  Thanks.

Thanks, that explains it.  So I think the answer to my last question is yes, I need to use V-Vocal multiple times, once for each clip that has been demarcated.  I think I'll do this, and not bother with separating layers.
 
I wonder if it would be easier, next time, to process with V-Vocal first on the whole track, and then do what punch recording is needed.  Of course, I might still need to use a little V-Vocal on those re-recorded parts.