group by
の順序が間違っているだけです およびorder by
;
...
ORDER BY
FIELD( t.type, 'initial', 'commision', 'overpay', 'penalty', 'penalty2' )
GROUP BY
t.type;
あるべき:
...
GROUP BY
t.type
ORDER BY
FIELD( t.type, 'initial', 'commision', 'overpay', 'penalty', 'penalty2' );