dimension problems autocad 2008

Why are my dimension lines stretching when I move an object? It
appears that there are points attached to the dimension that will not
move with the rest of the drawing and they end up stretching all the
way to the new location. This only happens when I try to move but does
not happen when I copy. I've never seen this happen before in earlier
autocad versions I need a solution asap...... I'm praying there is a
simple setting or variable. Thanks in advance,
K