Are you running the 7 pin connector in the RV? If so, the separate turn and brake in the RV cannot be passed through to the toad from what I found. Therefore, I suspect the way the kit was installed is not correct. The kit includes standard bulbs that are installed into the tail light housing. Depending on where they installed the bulbs, it may be lighting two sections of the tail light housing itself.
Watch the video at this link that shows installation of the kit, it will make more sense what might have happened. The sonic video is the one I looked at.
Link to Kit 155 installation video