There's a bug when changing certain parameters in the 'change parameters' dialog box, then attempting to undo that change after closing the box. It will undo most changes, but not all. However, visually they will still undo and go back to the way they were prior to changing the parameters, and even the change parameters box will reflect the undo correctly, but in the system the value has not been undone. Closing the file and reopening fixes this. Here's an example and how to replicate this bug:
1. Create a new parameter. Call it 'width' (or whatever). Set it to 5".
2. Create another parameter. Call it 'height'. Set it to 'width' <- this is what causes the bug.
3. Draw a square, setting its size to width x height.
4. Open 'Change Parameters' box. Change value of 'width' to 10". Close 'Change Parameters' box.
5. The drawn square changes size to reflect this change.
6. Undo this change. the drawn square goes back to 5"x5".
6. Draw another square, setting its size to width x height (again).
7. The width is correct (5"), but the height is not (10").
This only seems to happen when assigning one parameter's value to another, instead of an absolute value. Again, closing the file and opening it again will correct this.
Fusion
