I have some records taken from iRecord into ARCGIS that appear to have been distorted from their expected shape, e.g. at ST857104 about 1% of the records do not appear as squares, but with their corners shifted in apprently random directions - not enough to be unrecognisable but enough to look odd. However on the iRecord maps they are appearing as expected. Example record:  brc1|17888148. As far as I know we are taking the geometry direct from iR, not regenerating it. I have 1700 records that are recognisably too big for 100m resolution records and presumably a similar number that will be too small. 

Any ideas how this might have happened and whether it can be corrected?

Thanks

Gordon