I have a 320GB Hard Drive
If I click on the drive in Easeus and "View Properties" I think it shows me the partition information
Easeus View Properties
Used 13.3GB 97%
Unused 376MB 3%
Total 13.7GB 100%
(https://i.sstatic.net/KmKIk.png)

Here is how disk management reports it
(https://i.sstatic.net/ZwNTn.png)
OK
Here is how Easeus reports it

(https://i.sstatic.net/HUiv7.png)
OK
But I find myself unable to resize the partition. The partition seems to be 13GB and only a few hundred MB free on the partition .and it's a 320GB drive. So I want to resize the partition. But notice now Easeus makes it look like the partition is 320GB. (https://i.sstatic.net/YFcDo.png)
According to Easeeus's help, you're meant to expand it to the right
but there is no room to in the picture of what I see.