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What do you think happens when a Catholic priest offers the Holy Sacrifice of the Mass on an altar that contains a voodoo malefice ?

The altar? I’m not sure. P. the M. never attended Mass, not at OLMC. I never saw the man enter the chapel. Of course, that doesn’t mean he didn’t enter when nobody was around.
There is a bad spirit about the entire place that didn’t used to be there. The day in 2013 I overheard and then saw P. being abusive to Mrs. Pfeiffer, I knew for absolute certain he was no good. She stoically tolerated him whereas I did not. After she left, I gave him a piece of my mind. How dare he disrespect Mrs. P.?  He refrained from laying hands on me, but got in my face; threatened me that he knew certain spiritual secrets and to keep to “girls’ business.”  I think he thought I didn’t know what he was alluding to.
I told Fr. P. about it, and all he said was that he’d take care of it. 
He has said and done inappropriate things in my presence, several for which I rebuked him and called aloud on St. Michael. After one last encounter in 2013, I informed him that if he ever spoke to me again in such a manner, I would be summoning my father, whom, at that time was in excellent condition. (P. assumed my parents were deceased, I later found out.) All I had to do was call and I guarantee Dad would have been on a flight to Louisville within a few hours. After that, he steered clear of me. 
I had complained too, to Fr. Hewko about him once, when he mocked Mr. Pfeiffer to several seminarians. Fr. P. wasn’t there. How is it anyone dares to mock and disrespect the wife of the couple on whose premises you are living, who allow you to bury your adult son in the family cemetery, who are feeding and housing you?  Fr. Hewko minimized it the incident with me. Whether he did anything, I don’t know.
All I do know is that if anyone, warlock or otherwise, had tried that with my parents, his posterior would be gone in short order and the property exorcized and blessed by a priest.