Even some of the "standard" prayers are not as standard as we would believe. The "Our Father", for instance has different wording in English as spoken in Canada than it does here in the United States. In fact, the wording of the French language "Our Father" is different in Canada than it is in France.
Postures and translations of prayers are therefore not a part of the infallible teachings of the Roman Catholic Church. There are excellent, theologically sound reasons why the Bishops of certain countries, the United States among them, have decided that the liturgically correct posture for the reception of Holy Communion is standing.
Much is being made of a Vatican document issued in 2004 which forbids the priest to deny communion to those who would kneel for this sacramental act. In places where the norm is to receive Communion standing up, some people frown on those who receive Communion on their knees.