My calendar, for the day of August 22, 2004, states:
Twelfth Sunday
after Pentecost-G (II)
The Immaculate
Heart of Mary-W (I)
Sts. Timothy, Hippolytus
& Symphorianus
Marytrs-R (Comm.)
Which is it?
I think the I and II stand for Class of Feast Day, i.e., First Class, Second Class.
The SSPX calendar has them both as second class feasts.