A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
What width/height are you setting and what is the smaller value that they change to? Is this smaller value displayed while still in the "Page layout" view?
Note that if you change back to "Normal" view and select column width or row height that the result is displayed as normal whereby the width is related to average characters and height is in points but that should not have changed the actual size of the cells as set in inches in "Page layout" view.
Also, is your screen resolution set to "Recommended"? I have not tested if screen resolution has an effect on your issue, but it might.
See following Microsoft link for setting Screen Resolution.