AVG cleaner question

Hello Carole,

We are glad to clarify this for you.
We would like to inform you that the Free up space feature scans for and allows you to safely delete files that may be using a large amount of disk space on your PC.

You can review and clean the following categories:
System junk: Leftover files created by the system, programs, or installers, such as temporary, log, and cached files.
Browser data: Leftover files and tracking data, such as browser cache, cookies, and history stored on your PC while you browse the web.
To use Free up space, open AVG TuneUp and click the Free up space tile.

IMPORTANT:If you select the Downloads option for cleaning during a Free up space scan, we recommend checking that your Downloads folder contains no important or irreplaceable files before continuing.
Thank you.

Hello Carole,

We are glad to clarify this for you.
We would like to inform you that the Free up space feature scans for and allows you to safely delete files that may be using a large amount of disk space on your PC.

You can review and clean the following categories:
System junk: Leftover files created by the system, programs, or installers, such as temporary, log, and cached files.
Browser data: Leftover files and tracking data, such as browser cache, cookies, and history stored on your PC while you browse the web.
To use Free up space, open AVG TuneUp and click the Free up space tile.

IMPORTANT:If you select the Downloads option for cleaning during a Free up space scan, we recommend checking that your Downloads folder contains no important or irreplaceable files before continuing.
Thank you.

When I use this, it shows 1.7 Gigs of junk but it only cleans 238 megabytes.  Why?