Rainbow Six Siege low FPS / Frame drops on GTX 1070?

Feb 10, 2019
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I have a Ryzen 7 1700X, EVGA GTX 1070 FTW DT, and 16 GB RAM. I bought a new 144hz monitor too play Siege at 144 fps. It was playing completely fine until out of no where I noticed I was hitting 90 FPS and even dropping to 60 FPS while in fights. And just to mention, I'm playing on the LOWEST settings possible. I set my graphics to Ultra as a test and I was getting around the SAME frame rate as I was on the lowest settings. Is something wrong with my PC or the game?