As others have noted, if you had your pet following you around as you crawled through the dungeon, it's likely that its pathing glitched at some point (maybe it bounced down a pathway without you realizing or glitched through a wall and then popped back next to you, or something like that) and it had aggroed a bunch of things that you didn't realize.
Those aggroed mobs were likely going through glitching pathing while trying to chase you and your pet, and may have picked up other mobs as well. When you reached the camp and stopped running around, they were able to resolve the pathing glitches and all come running down on top of you. Only summon your pet once youre in camp, and keep it in the camp with you.
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