There are certain glitches in the books that makes you question.
At the end of New Moon, Bella says that Edward's return was like the last "eight" months never happened, but in Eclipse, Jacob said that she jumped off a cliff in March. Since he disappeared after her birthday, which was in September, then eight months later would be May, and not March.
Also, when Victoria tried to escape in Eclipse, Edward caught her and killed her. If Victoria had self-preservation, she should've felt the danger and evaded it.
I don't know what more glitches there are, but there's probably more.