Not sure exactly what you did there, but somehow you managed to hit the answer submission route twice within a few seconds. So the spam-checker got spooked and decided to test you.
Congratulations, you're probably human!
Designs across the network have been receiving updates in order to be more uniform. Non-functional design elements are only in the header and footer. Arqade is still one of the more design heavy sites on the network.
The design was proposed over the summer (according to chat, it was around the end of August), and implemented for everyone a couple of ...
After reading over the question several time, I finally noticed the top box says that the question is no longer accepting interactions.
Apparently this is the new wording for saying that a question is locked, though I find it much less obvious than it was prior.