WHY MY JOB SKIPS SOME DATE VALUE

Hi All,

I have a job that execute SP , that runs multiple time a day. It used to run fine for year but after few months it started skipping value from specific date.

Example I have WTD period slicer in the SP.  In one schedule pulls data from five date but in next schedule it pulls from six dates. The correct one is six date.

Is there any thing that I have to look at and check ?

Your help is highly appreciated.

Thanks

Bihon