I don't think that is what he is saying. I take it that when he pushes the latch button to pop open the trunk, it activates the locking mechanism switch, relockng everything. This is not normal, but having wired in a KE myself, the only way the installation is likely to be the culprit is if he added an aftermarket trunk release solenoid. This is usually only done on vehicles which always require a key for trunk access.
I would suspect an adjustment or repair is required on the trunk-lock switch. Since my only experience is with a different model, though, there might be another explanation.