Baseline Forecast has Null Values for last few buckets for some items

We forecast at a week, item and Site. We have Baseline forecast values which are null for last few buckets for some items. We cannot explain why system recommends zero (non zero values)  for 40 weeks and then 'null' values from 42-52 weeks.

This causing confusion as we are depending on the analytical engine to be consistent in producing consistent output for all the combinations in the forecast horizon.

We are not seeing any warnings of INSERT units. I am not sure if I am looking in the right place

I am uploading the screenshot so that you can advice me.