Is it weird to have a dream that come true?

It all depends on the dream

No, it is not particularly unusual to experience "a dream come true." The subconscious mind often notices details and subtle trends that are overlooked by the conscious (waking) mind. When the subconscious puts together obvious insights into a dream, it can feel very much as if the dream foretold the future. The process, although unconscious, is completely natural and has its own logic.