This is something that occasionally drives me nuts. It is very typical to have a report that mimics the look of a spreadsheet (you actually just format each field to have a Border around it like cells in Excel). However, arranging precise items like individual rows and columns may not be the easiest thing in the world. What you usually get is one or two items that for whatever reason don't want to play nice and line up perfectly.
The first thing I learned to do was move Report items by using my arrow keys, not the mouse. Select any Crystal object and try it. You'll feel a lot more control over how things line up this way.
The second thing I learned to do was occasionally turn off my Snap. Simply right-click within the designer and select (de-select, actually) "Snap to Grid". When Snap is turned off, you'll find that you can now move your objects with the finest precision. Don't forget to turn Snap back on before you add any new objects to the Layout; they will behave erratically once Snap is turned back on. A good rule of thumb is to Design with Snap On, Fix with Snap Off.
These two tips can save you a lot of grief and aggravation, especially when modifying cosmetically complex reports. (Adding a column in to stack of columns, etc.)