Too much power steering fluid

I have a 2005 Mercedes ML350 that I bought
about a year and a half ago. The only thing I
have had to do is pick t seems like every two
months I need to add power steering fluid (I
only need to put like half the of the little bottle
)well I put some in yesterday morning because
it was starting to make that noise it normally
does when I need it. I had a partial bottle left
over and went ahead and put it Allen.
Unfortunately I didn’t check the gauge at the
time. Well I was out of town also. Later that
day I went to drive back home (about 3 1/2
hour drive) and it was make a knocking noise.
Well I drove home anyway and it is still making
the knocking noise but a little worse. I just
checked the oil and power steering fluid and
the power steering fluid is really full almost to
the top of the reservoir. Would that cause the
knocking noise?