Hi,
Looking at your plot I see that the CLs line crosses the 0.05 line at around 16, so this is what the macro prints as upper limit. The normal procedure is to use as upper limit, CLs = CL(s+b)/CL(b) in order to avoid having artificial very tight limits when CLb is very small.
The expected limit is the limit obtained not using the observed data, but your nominal model values. It gives you an idea what is the sensitivity of your analysis. In your case you are observing data values perfectly compatible with your background model .
If you have further questions, please let me know
Best regards
Lorenzo