I have noticed that Latest data value does not correspond with last value in "Values" of an item.
I have sent 3 values of an item with nanosecond resolution. Values are sorted correctly (you can see on picture Values.png and test.key.txt file). Trigger was also evaluated correctly. But value of the item in Latest data overview is not correct (you can see on picture latest_data.png). There is value 1 instead of 3 shown.