Any thoughts on how to compete with that or determine if it is occurring?
If the sellers realtor says "Bring chequebook with N signed cheques for $X amount" or such, walk away.
FWIW Canada is USA circa 2005-2006 right now.
The other approach is figure out what the house is worth to you. Figure out what your max is before you start bidding and don't go above it when the bidding starts.
There'a always another house to come around.
Who would I check in this case, the seller? What would I do with this information once I found it?