So I only noticed this the past two days as my Maegu and Woosa mains are way ahead but on my alts I notice each time we have a quest progress dialogue, my horse mysteriously teleports right to me once the dialogue box is closed. Now most of the quest progression steps are fine but what if we're in Cadby Ruins say. My horse will get annihilated in seconds and I can't focus on her whilst keeping myself alive just because the Slayer quest was accepted from the Black Spirit. When did it get added? I have only got one Celestial Horse Calling Horn... on my Maegu so why is it both my Sorceress and Lahn that I know of; are auto-summoning their horses every completed dialogue sequence?

Greetings Claudija!

Regarding the horse changes there was a recent change that took place on May 17th with the addition of the Mount Transfer system. This new addition made it so when completing main quests your horse will follow you instead of you having to go & find it. 

I thank you for your feedback as we look to make further improvements to this system so it can be an added benefit to your gaming experience.