another swr question

ok so here my question i put new 22'' shaft on my wilson 2000 and checked swr they showed on my external swr meter.
channel 1-meter didn't move
channel 20- meter moved very little
channel 40-1:2
so i've never had swr that low on any set up before and i didn't believe my meter or thought somthing else was wrong but i went and raised my wip up about 1" to se if swr would change and they did.
ch-1-meter not move
ch-20-1:2
ch-40-1:5
so my question is how likely is it for my swr to be that low as they were the first time i chk'ed them or should i be looking at somthing being wrong ? like i sad never had swr that low just got me thinking somthing may be wrong.