Probably a couple days away.
Are the double entries exactly the same? Ar the tribe id 200000000 the same type of message (taming, killing etc)? If the system has a bad tribe id it shouldn't return a name because it is invalid.
This is one example:
(ARK Parabellum - Ragnarok)
:2000000000) Day 729, 18:53: Your Tribe Tamed a Baby Giganotosaurus - Lvl 143 (Giganotosaurus)!
(ARK Parabellum - Ragnarok) (The Chosen Few::1274789733) Day 729, 18:53: Daddy claimed 'Baby Giganotosaurus - Lvl 143 (Giganotosaurus)'!
(ARK Parabellum - Ragnarok)
:2000000000) Day 729, 19:00: Your Tribe Tamed a Baby Giganotosaurus - Lvl 144 (Giganotosaurus)!
(ARK Parabellum - Ragnarok) (The Chosen Few::1274789733) Day 729, 19:01: Daddy claimed 'Baby Giganotosaurus - Lvl 144 (Giganotosaurus)'!
(ARK Parabellum - Extinction)
:2000000000) Day 729, 05:59: Your Tribe Tamed a Baby Fire Wyvern - Lvl 210 (Fire Wyvern)!
(ARK Parabellum - Extinction)
:2000000000) Day 729, 05:59: Your Tribe Tamed a Baby Poison Wyvern - Lvl 222 (Poison Wyvern)!
(ARK Parabellum - Extinction) (Noe Bedre::1703676426) Day 729, 05:59: Lisa claimed 'Baby Fire Wyvern - Lvl 210 (Fire Wyvern)'!
(ARK Parabellum - Extinction)
:2000000000) Day 729, 05:59: Your Tribe Tamed a Baby Poison Wyvern - Lvl 210 (Poison Wyvern)!
Seems to only happens when a tribe hatches a egg and doesn't update the tribe id and tribe name before the dino is claimed.
or more likely since the dino doesn't really have a owner yet there is no tribe to put in so it defaults to 2000000000 until it's claimed.
Guess it's not much of a problem now that i'm aware of it.