I have a 3cx3000 amp that I haven’t used in a while because I just moved . I was setting up my equipment again when I noticed with my rig expert that my SWR was around a 2.5 So I was investigating the source of the high SWR because I know my antenna system was 1.1 . Long story short with just the tube amp inline and the antenna I have 2.5 . I also tried messing with the load and tube and input tune on the amp when off but still Didn’t change any idea what can it be ?