245 timer fields keep repeating 60 minutes in timer setting

Please can you help me?

I have set my main screen as DISTANCE second field TIMER third field PACE

However, when I start a run - the timer (or even when I toggle to Elapsed time - cycles the run time to 60 minutes and then restarts again on another 60 minutes.

This is HUGELY frustrating when you out for a long run only to now know how long the run has lasted for?

Please can you help me?

The watch is brilliant - I have obviously caused this but I don't know how I have done it, and I cant seem to change it - Its driving me mad!!

Thank you