This phantom control 156 is what's causing the finish time to appear 24 hours later as Or interprets the finish punch to have taken place after all the control punches.

The question is though, what's causing the phantom punches..??!!

We had a similar issue at the St Stephen's Day score event where the first finisher woke up the finish SI unit (a brand new one, not the one we used at Carlingford) and 12 hours were added to the time. Has anyone else experienced this?

All the other finishes were fine.

I suspect that this was nothing to do with the finish control.

If you look at the splits results, you will notice that a lot of people punched a control which displayed no time or code.

Based on the few people who punched all controls, the missing control appears to be #190. I suspect that this may have gone faulty during the event. Perhaps, the tab on the battery became loose and the time reset (easy to tell by looking at the time on the box). It is not possible to reattach the tab (I tried in the past) so the battery must be replaced.

Most SI cards can handle this but older SI cards which only store 12 hr timestamps cause an issue in Ór resulting in an added 12 or 24 hours. These old SI cards are the SI-Card 5 series with a number range from 1 to 500000.

Interesting. Control 190 was a bonus control for running in fancy dress so only some people got to punch it - it was held by one of the start team and offered to runners in fancy dress just after they started, that's why it was only seen occasionally.

The 24 hour additional time in my "kitchen table" event was a newer series 8 card.