January 28 is Aquinas’s liturgical feast according to the General Roman Calendar promulgated by Paul VI in 1969. On that date in 1369 Aquinas’s relics were translated to the Dominican church in Toulouse.
March 7 is Aquinas's liturgical feast according to the 1960 General Roman Calendar (and earlier calendars). Aquinas died on that date in 1274 at the abbey of Fossanova, where he had stopped after taking ill on his way with Reginald of Piperno to the second Council of Lyons.
The 1960 and 1969 calendars are still in force in the Roman Rite. The first applies to the so-called Extraordinary Form of the Roman Rite and the second applies to the so-called Ordinary Form. So, we celebrate Aquinas's feast twice.