It is not common for glazed ceramics to be out of square. Additionally, tiles are sorted and graded to remove any that are before packaging. Sometimes a few can slip through the system. These tiles are perfectly sound, but all the same are imperfect.
The generally accepted standard allows 5% of any first grade consignment to have some imperfections. 5% means that 5 tiles may have some imperfections in each group of 100 tiles. The tiler will always put these tiles aside and use them when a cut tile is needed.
If your delivery consists of a lot of odd shaped tiles, call the Beaumont Tiles branch from which you purchased the tiles. Something has gone wrong and the tiles may need to be replaced.
If the delivery is of mosaics that have been placed wrongly on the backing mesh, call the Beaumont Tiles branch from which you purchased the tiles. We will exchange the affected sheets. If your tiler decides to lay them and spend the extra time needed to straighten each tile when laying, that is his choice. We would not expect to compensate the tiler for extra time spent laying the tiles.
If the tiles have been installed we will resupply you with replacements for the faulty tiles. Your tiler will need to remove the faulty tiles and install the new ones. Visually imperfect tiles should never be installed unless specifically requested by the owner.