Strange clip behavior

It has to do with Tempo Changes! I took the next old file I could see, just to cut out fast three little clips, but in this file there were Tempo changes.
 
The length of the moved clips are following the tempo changes, but playing at normal tempo, no tempo change for the audio clips, but the holes are there, if I put them to the right....
 
After deleting any tempo changes, all is normal!
 
Bassman.
 

Yes, since the M:B:T grid is the fixed reference in SONAR, and the Now time cursor travels faster or slower according to the tempo, audio clips will appear to change length when the tempo changes. This can be a little disconcerting until you get used to it since it's natural to expect absolute time to be the fixed reference.
 
EDIT: Changing the timeline display won't change this; the visual intervals in the absolute time scale will vary with tempo while the M:B:T grid remains constant.