Closet floor is wet in bedroom. Wall of closet butts against bathroom wall. Baseboard heater directly behind closet wall in bathroom. Floor seem to become wet after showers. Bathtub fixtures have been replaced, please help

So now we start the detective work. This could be the baseboard heater, shower drain, shower mixing valve or even the shower arm. Start with verifying if there is any dampnest under the heater, mpost likely not but easy place to start. Back to you. PS do you have another bathroom with a shower or tub?