Actually, it's too early to declare that your floppy is fine. For example, if the alignment is a bit off, it may still read certain disks ok (because those may have been written by a drive with an error, too, but smaller than yours). But if you try to read a floppy written by a drive with an error in the other direction, you may not be able to read it reliably.

Dirty heads can also produce or contribute to this problem. Since it's easier to clean than to align, first try a good clean and see if things get better.