You are probably all correct that the heat molding process melted the glue and caused the shifting. Regardless, those are shabby insoles. I've ordered the Sole Signature EV Ultra footbeds
(
Sole Signature EV Ultra Footbeds | The Insole Store) - $45 shipped.
I've only ever bought 2 pairs of new boots so I'm not used to the process....but, after reading more on this site, I understand they are supposed to be uncomfortable (or less comfortable than hiking boots).
Less comfortable = more functional (increased response)
More comfortable = less functional (foot slides around)
I'll keep these and hope they pack out nicely...hopefully before I lose a toenail!