Size keeps changing in Tools, Uninstall, Save to text file

How does Tools, Uninstall determine the Size?

Many applications (not all), display a different Size each time we 'Save to text file', even if the version has not changed.

When we compare different install.txt files, this Size difference wrongly indicates that the software has changed.

How can this be resolved?

It's been buggy for years usually with displaying an incorrect install date, however the bug you're reporting is something new I believe.