From my experience, widths vary from 104 - 111 generally in UK bats. Sometimes you have to take into account that a batmaker may have slipped up with a tool or during sanding, or there may be blemishes/knots/dead wood they're looking to get rid of. In this case, it does appear to be intentional to get a bigger looking stock shape.
I've been told Babar asks for his bats to be narrowed, and also been told/heard from multiple sources that a large majority of pros have narrower bats. (Under 106mm)
Thing is, with the demand to fill the gauge in all dimensions to a weight limit of 2.10, or rather large bats at 2.8, you can see why some might decide to narrow, especially if counterparts across the sea have been employing this trick for years. If it doesn't sit well with you, then absolutely send the bat back as
@Yorkershire has done