Hmm. Very wierd
Try rebuilding the clustered index - DBCC DBREINDEX ('Actions') - and then do an update usage. See if that has any effect.
If not, then I'm really stumped.
From the show contig, it looks like there's lots of empty space within the extents (average pages per extent = 2. It should be 8 if the index has just been rebuilt)
Since extents are allocated to objects, not individual pages, that may well be your missing space.
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