Strange tuning issue

M0CLS
 

Hi, I have just completed the ubitx and put it into a metal case. Everything is working fine except when I try to tune in any station! When a few khz off on ssb the signal is coming in loud and strong until i start getting closer to tuning in the station and they just seem to fade away to almost nothing! When I’ve tuned the station in they are very quiet and barely audible? 

Any idea what could be wrong? 

73s 

Carl M0CLS

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