Some things to check:
- When you created the tracker, which statuses did you select for the Default status displayed in list mode option? Only items with that particular status will be shown (by default) when listing the tracker's items.
- When you created the tracker, did you enable the Do not show empty fields in item view? option? If so, empty items will not be shown when listing the tracker.
- When you created each field, did you enable the Is column visible when listing tracker items? option?
- When you created each field, did you enable the Field is hidden? option? If so, you need to explicitly allow anonymous visitors to view the field.