changed the water return lines that run from the control valve to kitchen sink & now have no water pressure?

i changed the water return lines that run from the control valve to my kitchen sink and now have no water pressure. i have a third spray nozzle and when pressed, the pressure is strong. the original lines were solid, but when we replaced the kitchen sink we stripped the nuts and replaced the water lines with flexible hoses. we needed an attachment to connect the end to the of the line to the wall valve. whats wrong, why have i lost all pressure coming out of the tap, but not out of the spray nozzle?

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