Two JTables changing each others data

I have the following swing setup:
JPanel mainPanel with GridLayout(0, 1)
JPanel tablePanelA with BorderLayout
JPanel tablePanelB with BorderLayout
JTable tableA
JTable tableB
The tables are 2 rows by 7 columns, and are two distinct instances of a class i wrote that extends JTable. They look and act the same, but there are two seperate references. They both use JComboBoxes to allow selectable data in each of the 14 cells.
I then have:
tablePanelA.add(tableA)
tablePanelB.add(tableB)
mainPanel.add(tablePanelA)
mainPanel.add(tablePanelB)
This sets up my main panel with the two tables on it looking how I want it to look. Heres the problem. Whenever I change the data in a cell in either table, the corresponding cell in the other table changes to that same data item also. For example, if i change cell 0,4 in table A to "None", then cell 0,4 in table B will also change to "None". You only see the change on a refresh of the panel, by changing windows to and from the panel, etc. Any ideas on why my tables would be changing each others data?

Any ideas on why my
tables would be changing each others data?It sounds like you're sharing a single TableModel instance between the two tables. When one table updates the model, it fires a TableModelEvent which notifies both JTable instances to update their views.

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