are you talking about paragraph rules or table rules? - you are using both terms in your post.
Please show some screen shots to help define the issue so we can help you solve it.
To set all the table strokes to the same color and weight:
(1) Make sure the entire table is selected. Click in the table with the Type tool and choose Table > Select > Table.
(2) On the table proxy (circled above) make sure all the strokes show blue. Those represent the outside and inside strokes in the table. With them all blue, use the Control panel to set the stroke color and stroke weight.