Pets disappearing?

Level 22 hunter here. So last night after googling articles, I decided to go allll the way to Bloodmyst Isle to tame a rare bear (Deathclaw) and spider (Zarakh). When I logged out with my spider and back in, my spider was gone and the bear was active. I checked my stable and the spider was GONE. So I spent today enjoying the bear, but when I got pkd by a horde, I logged out and back in, and now I have the spider, but the bear is gone from my stable.

What's going on? Is this a common glitch? Do I still have them both, but the stable is just not showing one of them sometimes?