Unfortunately there is an error in the flex schedules formulas in that leap day February 29 is not included.
In the formulas on line 83 (total) 81 must be corrected to 82, as follows:
Row 83, Column D: = SUMMER(D53: D82)
Row 83, Column E: = SUMMER(E53: E82)+H83
Row 83, Column F: = SUMMER(F53: F82)
Row 83, Column G: = SUMMER(G53: G82)
Row 83, Column H: = SUMMER(H53: H82)

Regards
Kari E. Lønøy
Senior Advisor HR department
University of Bergen
Mob .: +47 922 68 505 / +47 55 58 32 82