I have tried to upgrade from strike jammer level 2 to 3 twice now. Each time it reverts back to upgrading to level 2, including the cost and time of 3 days. This means I am now upgrading to level 2 strike jammer for my third time now.
(There was also an earlier upgrade of it that stated 1 day but took 3 days. But now I'm stuck and have spent helium multiple times on the same upgrade.)