Since you bought the paper secondhand, that is indeed a possibility; however, don't ditch it just yet. Different papers often require slightly different development times, so it's entirely possible that you underdeveloped the satin paper and properly developed the pearl paper.
Originally Posted by IOS
I know that both HC-110 and Rodinal (R09) can be used as paper developers; however, as this thread indicates, most people prefer to use developers that were created with paper in mind. There's nothing wrong with experimenting with HC-110 or Rodinal/R09 on paper, but for learning I certainly concur with the others who say you should try a common paper developer. Note that development times vary both between papers and between developers, so development times for Developer A may be off if you use Developer B.