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How it is possible for the Mass to not be a re-sacrifice of Christ when the Mass is called “a divine sacrifice” that is done over and over again?

We are told that... “the sacrifice of Christ and the sacrifice of the Eucharist are one single sacrifice..... that it is an unbloody offering that is proptiatory,.... that it can make reparation of sins,.... and is to be considered a true and proper sacrifice,.... (The Catholic Encyclopedia, topic: “Sacrifice of the Mass”).

There’s no other way to conclude that it is a sacrifice that occurs over and over again .....and since it is said to be a true and proper sacrifice that is propitiatory, then logically it must be a re-sacrifice of Christ...... If it is not, then how can it be called a sacrifice of Christ?

Also, how could it be propitiatory if it is not a sacrifice of Christ since it is Christ’s offering on the cross that is itself propitiatory?

Note again what I said above -- remember that God exists out of space and time. What happened then is an eternal NOW for Him. The divine sacrifice is a NOW.

The Mass is not repeating the murder of Jesus, but is taking part in what never ends outside TIME: the offering of Christ to the Father for our sake (Heb 7:25, 9:24).

The Mass is a participation in this one heavenly offering. The risen Christ becomes present on the altar and offers himself to God as a living sacrifice. Like the Mass, Christ words at the Last Supper are words of sacrifice, "This is my body . . . this is my blood . . . given up for you."

for all eternity He, who is out of time is appealing to the work of the cross, interceding for us (Rom 8:34), and bringing the graces of Calvary to us.

Sacrifice of the Christ = one time event in our history
God exists out of time
Christ, the High Priest offered a sacrifice in time, Himself, God exists out of time, so to God, it appears as the eternal sacrifice on the Cross -- to us, it is a one-time event, which has happened ONCE.
That is why in Revelation, we see the sacrifice as God sees it -- a lamb, standing as though he had been slain (Rev. 5:6).
Christ appears in heaven in the state of a victim not because he still needs to suffer but because for all eternity he re-presents himself to God appealing to the work of the cross, interceding for us (Rom 8:34), and bringing the graces of Calvary to us.
The Mass is a participation in this one heavenly offering.<
Note -- it is not the re-sacrifice of Christ, but the participation in the one-time sacrifice that has already happened
Christ's death on the cross was propitiatory and that is why God sees it as in revelation, a lamb standing proudly, giving of his blood, the Eucharist

For most details, you can check:
www.lcms.org --> yes, the Lutherans believe in Real Presence and so did Martin Luther who said

Who, but the devil, has granted such license of wresting the words of the holy Scripture? Who ever read in the Scriptures, that my body is the same as the sign of my body? or, that is is the same as it signifies? What language in the world ever spoke so? It is only then the devil, that imposes upon us by these fanatical men. Not one of the Fathers of the Church, though so numerous, ever spoke as the Sacramentarians: not one of them ever said, It is only bread and wine; or, the body and blood of Christ is not there present.

Surely, it is not credible, nor possible, since they often speak, and repeat their sentiments, that they should never (if they thought so) not so much as once, say, or let slip these words: It is bread only; or the body of Christ is not there, especially it being of great importance, that men should not be deceived. Certainly, in so many Fathers, and in so many writings, the negative might at least be found in one of them, had they thought the body and blood of Christ were not really present: but they are all of them unanimous.”

All are free to peruse, excerpt, read etc.
You can check the Vatican website
New Advent
Catholic.com
or, my favorite, the Holy Trinity Lutheran LCMS Church