>>>>Did you set it to float? Also add just one field above it with print when condition.
>>>>
>>>>Also does your detail band have constant band height? It should not be checked.
>>>
>>>OK I have just one other fields with print when - float is now set
>>>
>>>How do I set / unset constant band height?
>>
>>Double click on the detail band, it should give you this dialog.
>
>OK - it's not checked

No more ideas for now, then, except that may be you have blank records in your table.

I would probably start over with this report.