my analysis....
since you say platoon ic, not platoon sergeant or sect comd, i
believe you are in BMT, rite?
ok, so if your bed is skipped, can have many reasons,
1). Reserve best for last (i.e. you can be PL IC maybe towards last
few weeks where its REALLY the time to show out!)
2). Maybe they want you to be store IC, or other ICs,
etc...cleaning toilet IC... also the same lah...
3). Or even you have IPPT gold, you NEVER show out any team spirit
in your section and also never "lead" or help out ur section mates,
or that in JC or poly or etc, you dun have good CCA, like uniform
groups, military bands etc..NCC, blah blah...so you are NOT
highlighted to take up any posts.
REMEMBER that if you got no chance to show out your skills in IC
posts, very HIGHLY you will not be shortlisted for OCS, SISPEC, or
any better posts... 
NEXT time volunteer more ahh... 