I have a point shapefile containing records of bird sightings with location, species and land cover type that has about 30,000 records. I noticed today that one record is repeated about 60 times, with the same gps points, same location name, same everything. But when I highlight all of the repeating records, they are actually all different records. I can't seem to get the attribute table to accurately reflect the records; I've tried copying the file, renaming it, exporting the incorrect records to a new shapefile, restarting Arcmap multiple times, etc. Is the file corrupted? What can I do to fix these records?