The priest may have intended to absolve you from your sins and it may have been an innocent mistake in the use of words.
If you’ve confessed a mortal sin at this confession, I recommend you go to confession again, if not to the same place, then somewhere else. And keep in mind that if this happens again, gently interrupt Father and ask him to absolve you using the correct formula.
The words used in absolution are important…
CCC #1449 has the formula used in the Latin Church.
1974 Rite of Penance #46
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Rite of Penance #19
The Prayer of the Penitent and the Absolution by the Priest19 After this the penitent manifests his contrition and resolution to begin a new life by means of a prayer for God’s pardon. It is desirable that this prayer should be based on the words of Scripture.Following this prayer, the priest extends his hands, or at least his right hand, over the head of the penitent and pronounces
the formula of absolution, in which
the essential words are: ‘
I absolve you from your sins in the name of the Father and of the Son and of the Holy Spirit’. … …"
“NOTITIAE” 2015/2 REDISCOVERING THE «RITE OF PENANCE» scroll down to the section called Absolution, in the 5th paragraph -
" … … But then the style of language changes and the priest then says what the Ritual calls «the essential words» (
RP 19). Still speaking directly to the penitent, he says: «and I absolve you from your sins in the name of the Father, and of the Son, and of the Holy Spirit», making the sign of the cross over the penitent. The priest who says «I absolve you» is speaking here
in persona Christi ."