First off, thank you all for submitting these bugs.
The reason why Yeti Bot has a portrait of Annie pop up is that Annie is our placeholder portrait for practically everything until a new unique on can be made (rally flags have a portrait of Annie, although flags do look like little girls with giant Teddy Bears that are on fire). Yeti Bot has Annie's portrait because he hasn't been assigned a portrait. This is definitely a bug that will be looked into.
Also, Yeti bots, or bots in general, shouldn't be able to see through stealth, so we'll look into that too. We've been tweaking stealth lately, so that's probably why it's a little wonky. A quick question though, did the other team buy a vision ward or use Clairvoyance? That might be the reason why Yeti was able to see you.
I don't know what's going on with Jax, but we'll also look into that too. Did you see this in just the platform or in the game as well? Have you been able to reproduce the bug?