I dunno about that flavor, specifically, but, one of the biggest reasons I LOVE Ave juices is because the TH is beastly.
Allow me to clarify, I don't think that it's a mistake, I just think that Ben and the Crew use Top Quality stuff and it shows in how the juice vapes. I cannot vape higher than 12mg, else it destroys my throat. However, using 12mg juices from most other companies doesn't really give me that "umph" needed to satisfy my TH cravings. AV's 12mg Boba's Bounty gives me everything I need flavor, TH, and vapor-wise without any detrimental repercussions to my throat.
So, in a nut-shell, I think that it is normal. You're just not used to the greatest juice made from the greatest vendor quite yet. Give it time or consider cutting it with a lower mg of the same flavor.
/fanboy rant