Hey @ExpectedYou,
Can you share the collision profiles for your hunters and apples? Also, does this same behavior occur when only one hunter AI is in the level? They may have an issue navigating around each other. If the issue is resolved by only including one hunter AI in the level, consider using a Detour Crowd Controller. Detour Crowd is a great way for multiple AI to navigate around each other, especially while moving. More information on Detour Crowd can be found here.
I hope this information helps, and good luck!