Read the instructions that came with the mold again. Lube the points where suggested, clean with a solvent before use, smoke the cavities, etc. However, some people are a little heavy handed to learn to use an aluminum mold and would do better with an iron one. As much as I prefer iron molds, I cannot really say that when treated properly, the aluminum molds will not cast good bullets without problems.
Sometimes you get what you pay for, sometimes you only pay more for what you get.
Three shots are not a "group"...they are a "few".
If the Bible is the literal, infallible, unerring word of God...where are all those witches I am supposed to kill? (Exodus 22:18)