When you want to quickly sort a table column in reverse order, it is intuitive to click on the header twice:
once for forward order and another time to reverse that order. But the second click is lost and the table is
sorted in forward order.
To demo this behaviour, open Mac Finder (or Windows Explorer) and double click on a column's header.
The column sorts once for each click.
On JXTable, the table ignores clicks after the first one.