That's just the way it works. ALL of the columns affect ALL of the rows. (If you merge cells together, the cells are still there, just hidden).
Let me see if I can explain this:
Any rows within a column can be moved,
holding down the shift key while moving the width of the cell,
except the last cell of the column, if moved will change the width of the entire column
1 Column = 4 cells
You can move the width of cells 1, 2, 3, without incresing the colunm widht,
but, when you adjust the 4th cell the entire column will move.
I hope I did not confuse you.
Yes, you're accurately describing InDesign table behavior. If you adjust the right side of the last column, you're adjusting the width of the entire table.
Is there a question here?
Steve, I had no question, I was responding to r_trist.
Just needed to hold down shift, and that did the trick...I was able to manually adjust the inside row and columns to fit my grid accordingly.