This is a difficult problem for neophytes. When you enter a name, (and fill out the information) WikiTree checks to see if that name (or one similar) has been used. If so, it gives you two options. One, to check the circle infront of the name that is your person and confirm this this is the same person, or not check the circle, and enter a new profile. Its possible you confirmed that it was the same person, without realizing that it really wasn't the same person, just the same name.
If this is the case, (what I had to do) go back, and enter that person's data again, then when asked if this is the same person, ignore that and make a new profile.