variables do not change with time after certain time points


I have run the Mid range test case (Dorian) for 21 days on Cheyenne. the model was just cloned recently (roughly in the past two week). I found the time series of results stay flat after ~15.8 days. Please see attached.

I wonder whether this is a known issue, or is it suppose to be like this because it is for unto 2 weeks of simulations?

I have submitted a similar post last week not sure it went through. Decide to do it again..

Thank you for any advice.