Okay... well, I'd say that given the nature of the activities you listed, some soreness from them is normal. I don't know what your armbar drills consist of, but in BJJ terms, tap early and often. As far as roundhouses go, talk to your instructor. Maybe the floor could be made less sticky, or, better yet, maybe there's a hitch in your form that you could correct.

Warning: Take everything you get with a grain of salt - there is a lot of bad information that my cursory Google search turned up. On top of that, I'm having some trouble finding good stuff on Google Scholar. I'm putting in an order for some books on Amazon this week - if I pick something up that might apply, I'll let you know what it says.