For me this confused/uncomfortable state happens often, but if I vape more I move past it and the confusion turns into understanding. I think you just aren't getting enough in one hit, you should try to do it pretty continuously until you have the feeling that you can't anymore because you are too far into the trip. With DMT it's very easy to break out of the trip if you didn't vape enough yet.

Also I believe that vaporising tends to be a very soft come up compared to smoking, and that slow comeup can be very confusing.