Is a buffalo nickel liberty p 2005 e pluribus unum normal?

Yes, it's normal. It's one of the two new design for 2005 nickels. Soon you will be finding the other 2005 reverse design called "ocean in view". The motto E Pluribus Unum ("From many, one") has appeared on nickels since 1883 and on all circulating U.S. coins since around 1916, so this generally isn't a distinguishing characteristic. The most important characteristics are denomination, date, mintmark, and condition.