Apple Watch Monthly Challenges

I have a monthly challenge to complete 8 runs of at least 5 minutes each this month. I have currently done 4 runs - I can see this on my Activity App on my phone as well as in the ‘Show All Data’ section of the Workouts page of my Health App. My watch though does not tally with this - it was displaying 3 runs but after the 4th run it didn’t update. I restarted my Watch but this resulted in the watch now saying I’ve only done 2 runs! All 4 runs that I have completed this month are well over the required 5 minutes - each one has been around 35 mins.

I have restarted both my Watch and my Phone. I’ve also done a ‘Reset Sync Data’ from the Watch app but I cannot get the correct information of 4 runs in the Activity App to transfer to my watch.

This is very frustrating - I work hard to meet the challenges each month - they are, I assume, designed to motivate us. It’s not very motivating to miss out on achieving a challenge due to a technical glitch. How can I fix this please?