There are some gospel acclamations (and seasonal psalms) that can be repeated from week to week. The former music minister at our church did this. I was always confused, as the acclamation and psalm response in our missals was different.
Now I am the music minister and we always use the psalm response and acclamation in the weekly readings. In my opinion, it follows more closely with the other readings used in the Liturgy of the Word, as well as causes less confusion in the pews.
That being said, it is “legal” to use a repeated psalm and/or acclamation. So continue to worship faithfully and make a joyful noise unto the Lord!