It seems to be just ECL that is not respected. This is a freshly-summoned Cornugon by a level 30 star pact warlock without Spell Focus (Conjuration)
The difference between this and the picture above would be accounted for by the original poster's Spell Focus (Conj) and Greater Spell Focus (Conj)
Furthermore, the Star Pact-specific warlock skin is no longer applied to tier 6 Eldritch Summons
As an addendum, all of this behavior was previously only exhibited after you switched server while you had your summon out and the creature was 're-summoned' on the new server, but now it happens all the time, even with freshly-summoned creatures.