[MC-96433] strange render/view problem with custom skeleton

i was about to start a new boss fight with custom skeleton,
i used this code:

/summon Skeleton ~ ~1 ~ {CustomName:"_StiNgeR_",Tags:["TheBoss"],ArmorItems:[{},{},{},{id:skull,Damage:3,Count:1,tag:{SkullOwner:{Id:"a6cb7c96-9c40-4f93-8219-04561a7c69e7",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6IiJ9fX0="}]}}}}],ArmorDropChances:[0.085F,0.085F,0.085F,0.0F],Attributes:[{Name:generic.maxHealth,Base:666},{Name:generic.movementSpeed,Base:0.5},{Name:generic.attackDamage,Base:4},{Name:generic.followRange,Base:50},{Name:generic.knockbackResistance,Base:0.5},{Name:generic.armor,Base:10}],Health:666.0f,PersistenceRequired:1,Silent:1}

i first summoned 1 - no problem,
when i summond more.. well i cant realy explain it, so i recorded it,
https://www.youtube.com/watch?v=TyHxlBOv6jo&feature=youtu.be
the first 50 sec is to show no command making it and the comand itself.
u may jump to sec 50, and well, i tried to make it as clear as i can.