Is it normal to put a high buy order in, and then low ball for a response?

Specifically,  this trader posted a fresh buy at 39 keys for a Sunbeams Ze Goggles;

https://backpack.tf/u/76561197999873164

This;

https://backpack.tf/classifieds?tradable=1&craftable=1&australium=-1&item=Ze+Goggles&quality=5&particle=17

Then magically responded by saying the price on the fresh listing had changed to 36+1 refined.

I was under the impression that we had to honor our listings but if that's not the case...