TPS1663: eFuse starts up without microcontroller signal

I am consistently running into a problem when using the TPS16630PWPR eFuse; when I connect it to the supply voltage (in this case, 13.8V), the eFuse MOSFET is active even when there is not a HIGH signal applied to the nSHDN pin. I've begun to make a new board to try to troubleshoot from scratch, but I am consistently running into the same issue. Right now, aside from the eFuse, the only other components on the board are R1, R2, and R3 (422k, 45k, 30k, respectively) for UVLO = 8V and OVLO = 20V, and a 6k resistor to set the trip current (in this case 3A). When I connect the the 13.8V supply, I am able to detect approximately 13.8V on the OUT terminal, even though there is no microcontroller sending a HIGH signal to the nSHDN pin of the eFuse. In addition, I am measuring a voltage of 2.55V on the nSHDN pin, even though, as I mentioned in the previous sentence, there is no microcontroller sending a HIGH signal to the nSHDN pin. I have checked thoroughly for any short circuits that may be causing this issue, but the only conclusion I can reach is that somehow, the 13.8V power supply voltage is being stepped down to 2.55V and applied to the nSHDN pin, which is causing the eFuse to turn on even in the absence of an external HIGH signal. Should this be happening? Any help would be appreciated. I also want to add that the eFuses are certainly performing correctly in other regards - when I change the value of R1 to 100k, which sets the OVLO to below 13.8V, the eFuse becomes an open circuit, as it should. So it works in that regard, but I have no idea why the MOSFET is being activated in the absence of a microcontroller signal. Thanks!