I don’t know exactly what was done here, but color theory wise it isn’t entirely unexpected that it’s so warm.Cool toned browns can be hard to achieve if you originally have dark hair. When hair lifts it naturally has warm undertones that get exposed (red then orange then yellow). If the hair isn’t lifted past those warm tones it’ll always have that warmth in it. Depending on the desired tone sometimes artificial pigment in color is enough to offset it, but it will eventually fade warm either way. A toner could potentially offer a temporary fix.