There were definitely some issues with the guide that were caused by the upcoming daylight savings change, these have been fixed and the guide is now all good.
Looking at the first screenshot though it looks like all of those silent witness's had the grey icon so were not actually scheduled, but only showed up as you had the series set as a favourite. There is nothing you can really do to get rid of these, but as the guide was fixed they would have all disappeared.
We are looking through now for any leftover timers that didn't get cancelled correctly (they should have been cleaned up as the guide was cleared up).