Inserted row with fields that fit in a column; &1 &2 &3 &4

What causes this issue?

This row contains one or several fields that fit in a column of the
table on the basis of the horizontal position and the output length. The
column heading is assigned to these fields. However, the row contains
fields that do not fit into any column. Therefore, the row is termed as
an "inserted row".

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.