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Curb Inlet on Grade Efficiency

I checked SewerGEMS help and found Bentley SWMM is using HEC-22 equation to calculate the inlet efficiency, is that correct?

upon reviewing the efficiency calculated by the model for example (CB-433) in the shared model with scenario "5 Year 45 minutes" and perform the hand calculation as in the shared excel sheet; I would clarify the followings;

1- does SewerGEMS calculate the inlet efficiency as per HEC-22 shown in the help?

2- why the hand calculation does not match with the model results as shown in the shared excel? can you provide an excel modified in case there is a mistake in my excel for verification?

3- would you please elaborate why the graph in the efficiency does not back to 100%, it ended to the end of simulation at 40% ? while the excel shows the graph back to 100?

PS: in the same shared model; when I do zoom extend the model does not extend and I zoom little out I saw many dash lines, I did compact Database and Update Database Cache but still the problem there (Screenshot is below).

The model and the excel are shared in Bentley Share Drive

Regards,

Mohamad Azzam