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Most likely, it is Windows that is doing this and not Lightroom. Windows can change drive letters depending on the order that you plug them into USB ports.
The easiest solution is to change the drive letters back to what Lightroom thinks they should be. If Lightroom thinks the photos are on the E: drive, then change the letters on your drives (E to something higher in the alphabet like T U V, and F to E)
Appreciate the reply, Paige. However, not all in F were 'misplaced"(1st half of 2017 is not affected) and not all in E(i have other documents) that was "misplaced" form F needs to be relocated back to F. So I cannot just change the drive names:(
On LR, I tried to physically relocated the individual dates back to F which worked but now have them merged by year 2018. So all the few days i shot is no longer seen in F as seperate days.