In any site, change the Grading Schema to "Grade Points" and click Update. (You actually see this issue right away, without needing to click "Update".)
The Grade field is narrower in 19 than it was in 12.4, and does not widen to accommodate the extra information. As a result, you can't read the GPA numbers in the field. Interestingly, the column widens to accommodate the extra info when I switch to tablet view.