I've had a couple times that had happened. Only for a slight second though. One of my systemmates removed me from a discord server a couple weeks ago and it took me a minute to realize it. I also have a friend who's "unclassified" headmate took control and punched someone before.
I will recount, Maria, that if you are hallucinating, which I am assuming that you are not really, I would advise you seek medical help for it, as it is a serious sign that there is something wrong with you. I do not think you are actually hallucinating, as if you were, I do promise that you would want medical help as it is distressful to not know what is real or not.
I find it rather kind, when I was hallucinating and did not know, and people realized I was behaving strangely, I would have been appreciative had someone pointed it out, at least I would be now.
5:39 AM
Of course, that had nothing to do with tulpas, and I did not realize it, but both are very strange behaviour.