FS date calculation issue

edited 12/09/19 in Smartsheet Basics

I have the following calculated task dates in a gantt chart:

Task no.   Duration     Early start        Early Finish       Dependency

22            60d            1-Feb-2021      23-Apr-2021

23            60d            29-Jan-2024    19-Apr-2024       22FS+720d

(See attached screenshot) Task #23 is supposed to start 720d after #22 has finished. But if you manually check the number of days between Task #22 finish and Task #23 start, it is over 1000d - nothing like the 720d. Any idea of the logic? I use calendar days for my durations and lags; only Saturdays and Sundays are non-working days.