That means they panelized it. This is very common and some assemblers will not assemble a board without it. I am guessing your board was bigger than 2 inches?
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There was a very thin extra track around the board.
Cheers
Ian
True, I just file off the remnants of the mousebites, but that is an extra step. The other issue you had... I do not quite follow? You mean there is an extra track around the board? Never seen that