For some specific project files, open merge graphs dialog.
Clear any preselected graphs. Make sure number of Rows OR Columns is greater than 1.
Click triangle button and select the Graph Browser dialog and select Graph1, then select >> to add it first.
Then select Graph2 and click >> to add it second.
Click OK
==>Preview shows Labels are messed up
If you repeat above but select Graph1 and Graph2 at the same time and add both at the same time with >>
--> No problem with labels.