Regarding Parameterization properities

Hi Everyone,

                   I have one scenario in loadrunner(http protocol)

i)user login

action

{

ii)search id

iii)view id details

}

iv)logout

                   I did parameterization for id,my .dat file contains 22id values.My question is:while i am running for 3 user with 3mins runs.these are the behaviours observed

i)parameterization properities of id file(sequential):

               i)Enabled full log.my searchid and view id details page got 72 number of transaction in transaction summary graph.

ii)parameterization properities of id file(random):

              i)Enabled full log.my searchid and view id details page got 22 number of transaction in transaction summary graph.

                   My doubt is this normal behaviour.Is this the way loadrunner works,or it is the problem.Please clarify doubt.