question

This might still be the same bug mentioned here. The source always uses the table as if the model starts on a monday when the weekly mode is used.

As a workaround I can offer the following code that allows you to quickly shift the table entries by a set amount of days. Whenever you change the start date of the model, run the code so that the "Monday" column contains the data for the actual start day (and the rest of the values will be shifted accordingly).

// Adjust the path to lead to the respective source activity (PF Name and Source Name)
treenode arrivalTable = Model.find("/Tools/ProcessFlow/ProcessFlowName/SourceName>variables/arrivals");
treenode dummyTable = createcopy(arrivalTable, arrivalTable.up);
int shiftBy = 1;    // The amount of days to shift the arrivals backward
for(int i = 1; i <= 168; i++)
{
    int shiftRow = (i + shiftBy*24 - 1)%168 + 1;
    treenode QtyNodeReplace = createcopy(dummyTable.subnodes[shiftRow].subnodes[3], arrivalTable.subnodes[i].subnodes[3],1,0,0,1);
}
dummyTable.destroy();