Data missing

Hey I'm really really new to crystal reports and I'm working on setting up a new paramater field and I'm running into some issues. The table for some reason is not showing all the data it should meaning its missing some records. When I go into SQL manager the data all seems to be there and in order but when I pull the same data into crystal part is missing. I looked at the way I had the tables linked to see if that would have something to do with the data is coming up but from the best I can tell everything looks fine. Has anyone noticed similar issues with a report if so what steps did you take to hunt down the problem?Did you use any Selection Formulas?
If so remove them
Also Do Verify Database