New Plot Entries Disappeared From the Series Main Index

Hi,

I am gradually adding plots for an old UK TV series Old Country However, the plots that I recently added for series 2 have dissappeared from the series index page here (so far I've only added the first 5 programs).  They are still visable on the individual episode page, so they are still there, see here for an example.  

Can this be looked into please.

Thanks

Don