ovens

[pianistimo]

i baked some brownies tonight and against my better judgement put the pototoes (cooking potatoes at the same time) on the top rack and the brownies in the middle.  then, i pull it out to look and there's a hump in the middle of the brownies.  obviously the heat was not equalized or something in the middle - whereas whn u cook pototoes there - no one notices if they are cooked a little more on one side or the other. 

is this a flaw with my oven - or is it common to have better heat equalization on the top rack? 

[pianistimo]

strange!  i took the potatoes out and switched places with racks (putting the brownies on the top rack).  the hump went down after a few minutes.