Infracted is a word, but they are not using it in the right way.
So they should start to use it in the proper way.
It's derivative terminology.
When you infract a rule (generally in sports) you receive a penalty.
This penalty is generally referred to as an infraction.
As the moderators are giving you an infraction (as defined above), they are infracting you.
Mutability of the English often leads to cases wherein a single term can have contradicting meanings.