I refilled the ink for my lexmark printer and now it won't print properly. how do i fix this?

it's a z705 lexmark and we have had it for a couple of years now. When it prints it comes out really light as if the ink is running out but that can't be the case because I just refilled it. I got it refilled at walmart. This was my first time getting my ink refilled instead of buying it new.
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