Completed expedition shows as new and not completed

[Shakhan64]

I finished expedition 20 and got my rewards then found this site in order to do expeditions I missed. I rolled back with the expedition generator and completed expedition 1, everything looked great. Next day I went back to the console in the nexus to find expedition 20 there with a start expedition button, I still have all the rewards but it shows like I did not do it at all. Anyone heard of this and know how to fix?

[cwmonkey]

I think you mean 21, not 20 (current is 21, Remnant).

You most likely went online, which causes the current expedition's config to come back. You need to replace it with expedition 1 and go offline again if you want the option to play that. You can play expeditions as many times as you want, but you can't play the same one two times in a row without starting a different one first, this is likely what you inadvertently did.