The same post can't be infracted for more than once unless in the extremely unlikely case of them being given at the same millisecond.
Only mods can issue infractions. The reasons together with the posts were sent to your email (if you have it enabled). A thread can receive more than one infraction, a post can only receive 1 infraction.
And never post to complain about infractions - contact a mod privately to ask your questions. In this case, count your blessings. You got a few infractions, but you were eligible for an immediate 7-day ban.