After driving in heavy rain with rainwater splashing over the hood, it is stuck in 4-low?

I have the vehicle listed above Sport, my boyfriend was driving on i40 and was raining really hard and splashing over the hood of my vehicle and it went into 4 low in high speeds, the 4wd light was flashing and it is not now after getting a used actuator and changed it, there was a frayed wire that was going to the transfer case and was thinking it shorted out due to the rain causing it to stay in 4 wd low, after changing the actuator you are able to only drive in 4wd low forward and in reverse, and same with driveshaft out, will not engage in 4 wd high or 2wd. When trying to shift in high or 2wd it will sometimes cause grinding noises but not all the time. Thank you in advance and any help would be really appreciated.