Selected size bigger than actual file size

[mike20021969]

Occasionally, sometimes a file selected for download (e.g. 7.26MB) actually downloads more than the actual size of the file (12.0MB). See image.

At other times, on other torrents, both the selected size and the size are equal.

Why the discrepancy?

Uploaded with ImageShack.us

Thanks.

(I did use search but couldn't find a topic that was asking the same sort of question).