Another case of news media sensationalizing what really happened. There are two spiders in the habitat (spider habaitat, not ISS human habitat). The goal is to see how two spiders will interact in micro-gravity.

For about the first 24 hours after launch only one spider was seen. After that BioServe Space Technologies at CU Boulder (the group responsible for the habitat) located the other spider. It had simply been outside of the view of the camera.