Managed to miss a slightly subtle bug with how enemies were spending their level up points, or rather more to the point, how they weren’t. Thanks to wizzzargh for the quick catch and report! Build links to the right have been updated with the 1/7/2017 build which fixes this bug.
Unfortunately it is not retroactive: any demons that already spawned with boosted levels will not gain their proper stats nor does it correct when they gain additional levels naturally, so please switch ASAP. Thanks!