Query returns duplicate rows

[Brock Jimmy D Contr 74 MDSS/SGSI <Jimmy.Brock@xxxxxxxxxxxx>]

My query is returning duplicates rows.

table: elements
elementId
standardId
elementtext
category
mcode
linenum

table: scores
scoreId
taskId
scores

Here's my query:
SELECT distinct elementtext,cateogy,mcode,linenum,scores,scoreId
FROM elements, scores
WHERE scores.taskId='12'
AND elements.standardId='APR.05'

This is returning duplicate rows, even though I'm using the DISTINCT keyword.

If I remove the field scoreId it is fine.

Any suggestions?