Windsor Admiral 8 leaving a middle dry line

[owenbyc]

hey everyone im new to this site and i have a question. My carpet extractor is leaving a line right down the middle thats not wet. jets are clean and i can set thru them perfectly equal. this machine doesnt have any filters behind the jets just a solution tank screen filter that is clean. when under the machine the right side doesnt seem as strong. the machine just started doing this after 3 years. the machine is a windsor admiral 8. any help guys would be appreciated.