This may been have a bug in R2019a as R2019b resolves it.
UITable keeps making double CellSelection callback
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Bereketab Gulai on 27 Sep 2019
The callback is used to add the selected cell to another table in the same uifigure yet it is behaviour changes it most of the time makes double callbacks and it sometimes only single which the correct behaviour required. Is any settings that can be looked at. Recently there was an upgrade from R2018b to R2019a which has more features and behaviour especially to the tables.
I have made StackOverflow question, please take a look there is more code and details; for more reference. https://stackoverflow.com/questions/58166880/uitable-keeps-making-double-cellselection-callback