Calculated Field In Re****t

I use Paradox 7.

I have a calculated field in a re****t as follows:
[INCENTVE.City] + ", " + [INCENTVE.State] + "  " + [INCENTVE.Zip]

Obviously the data is drawn from the

CITY
STATE
ZIP
fields in my database.

However, if the fields are not in the exact same order as when I made the
re****t, there are issues.

For example, if the fields are in the following order in the table

CITY
ZIP
STATE

The re****t will print:

TRENTON 08648 NJ


Is this normal behavior?

Thanks in advance!