If you have multiple datatables with combo boxes:
Click on a cell in ‘From’ or ‘To’ column in the first table and you will see combo options. Now click on a cell in ‘From’ or ‘To’ column in the same table and again you see the options. This is the desired and expected behaviour!
Now click on a cell in ‘From’ or ‘To’ column in the other table and you will not see combo functionality but get text editor instead