SharePoint – download file size missing and document library

Noticed something odd with SharePoint today – was downloading two zip files from the same SharePoint document library.  I’m told the sizes are 25mb and 65mb respectively.

Ignoring the middle picture – which was me clicking the same link twice…  notice how SharePoint has informed the browser how big the 25mb download is.  But doesn’t seem to have the same data for the larger file download.

Only mystery here – no answers yet.  Haven’t start digging.