The one with the red leaves doesn't look quite right to me, but I'm not sure what may be going on. If you wiggle the stem does it seem firm?
This plant makes a lot of powder. There is no stage of life where there isn't a lot of powder on mine. It just got a lot thicker when it was growing a bloom stalk. Get an ice pick and tickle some of the powder and see if any move or crawl. If they don't, then I'd suspect the plant is producing it naturally. I have to move mine inside tomorrow. It's been turning redder this last month as the days got a bit cooler and shorter. Not as red as yours, though.
