When I worked at a university's tech support, this was a recurring problem. People made grade lists in Excel, then imported them into the digital learning environment, which occasionally was set to a different language. This meant that the decimal point would be disregarded, and e.g. an 8.5/10 would be imported as an 85 (which got clamped to 10). Maximum grades for everyone, confused students and teachers :')

Even better: grades range from 1.0 (best) to 5.0 (failed) with partial grades (.3, .7) in-between. Caused a few problems when a 1.3 got interpreted as the first May and converted to the number of days between the epoch and the first ofay of that year.