Endnote 20, 21 updating references with the wrong year

I’ve noticed with a lot of my older references, when I try to update them in Endnote, the update will come back with completely the wrong year, though typically it will be in the early 2000’s. It happens with multiple publishers – DeGruyter, ACS, RSC, Wiley, etc. It seems to happen most commonly with older papers (say, from the 1960’s and earlier). What’s going on? Is there something that needs to be adjusted with the data filters? Has anyone else seen this, and what’s the solution? Honestly, I’ve seen this with every version of Endnote since X7, and I am hoping there’s an easy solution. How to fix this?