I believe it's literally stated somewhere in the description for the RP that there may not BEE more than one instance of the same power, except maybe a modified version when the two are related, and those are rare. 

Also, I am apparently going to get even sicker tomorrow, which really sucks because I can't stand this, but I'm not going to question Mr Doctorman. Honestly, if this gets worse tomorrow, just assume I won't even be on for a couple of days. Sorry!