I think the web version got bug, instead of 2 baby spiders it multiplies into 4. They're even stacked on top of each other so it looks like 2 but is actually 4. No wonder I received 2 hits each.
Wow! That's sneaky!! Thank you for letting me know! I assume you killed them with the bow?
Well yes, i'm a bowman after all XD
This should now be fixed in the latest version 😊