It is a known issue. Expect a rules update shortly. 

On Wednesday, August 27, 2014, Rick Fontanilla <[log in to unmask]> wrote:
We recently set up our Field Mat on our FLL table and we noticed it is short
on the East-West length.  We have about a 3/4 inch gap at the end.  I
checked our table measurements and it is correct based on table building
instructions.  Has anyone else noticed this and what is the official rule for
lining up the field mat?  Should it be flush against the West and South walls?
This will make a difference if we use the walls as reference points.

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