Yes, this is an issue and it is has been passed on to the R&D department. It occurs for the following date specification codes with the .L extension...

%E22.L Invoice date
%E40.L Ship to date
%E45.L Invoice due date
%E48.L Discount date
%E49.L Retainage due date
%E62.L Creation date

There are two options for correcting this problem:

Option 1:
Edit your specification to use the .M extension instead of the .L extension. The .M will print the abbreviated name of the month e.g. Sep (width 3).

For example, instead of %E45.L for the Invoice Due Date, use %E45.M.

Option 2:
Alternatively, you can type in the word ?September?, and use the .D and .Y extensions to display the day and the year.

For example: September %E22.D %E22.Y

You will only have to do this for the month of September.