Does anyone ever have this issue?

create new feature, (e.g. simple extrude).  sketch out profile, accept, then suddenly broken reference error comes up.  look at feature tree and notice new feature is not at the bottom of feature tree, but instead has jumped a few places up above some of the features it was supposed to be below.  this obviously causes reference errors immediately until i grab the feature and drag it down to the bottom of the feature tree where it was supposed to be.

anyone know why this happens?  Is there some hidden function in SW for creating a feature that is not at the bottom of the tree?  i must be accidentally making this happen.  I have SW2011 but have had this weird annoyance in 09 and 10 as well.