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!