Hi there!
I also have the same issue: I tried to drop 2 TB:s on December 30th 2018 - which did not work out.
I have tried pretty much everything from reloading, logging out, updating Android app version etc
Strange thing is that I retrieved a TB on the very same day and time and THAT log was updated!
But not the "Dropping" part.
So Iog still says that I have both TB:s in my possession. Although I don´t anymore.