How old are they? Males or females?

You said..."one of them seems to have a problem with its front arms seem to be a little bulgy and are bent in an odd way"...can you post a picture please? It could be MBD.

You said..."one of them was in the hot spot and was brownish with red stripes. I was wondering what these colors mean?"...it was likely trying to warm up. Colors often darken when the chameleon is cold. What's the temperature in the basking area?

Here are some sites with good information that you might like to read...
http://www.adcham.com/
http://www.chameleonnews.com/
http://web.archive.org/web/20060502074401/www.chameleonjournals.com/vet/index.php?show=5.Vitamin.A.html
http://www.uvguide.co.uk/index.htm