Had anyone else noticed a problem with their Annapurna Circuit data? Mine has changed from 94 to 161 miles although the badge states 160k. I hope this is rectified as I should be half way there now.

According to Google the Annapurna circuit is 100 to 145 miles, Garmin just changed it from km to miles. Garmin apparently can't afford to do the job properly and change everything else like the text and the pictures. I personally think it is an f'up as any good developer would have made the changes properly.
That range is from Wikipedia.
If you check distance from Besishahar to Jomsom, then it's longer.
Google Maps display 148 km on foot and 264 km by car.
Some websites list range 160 km to 260 km, others 160 km to 230 km.
Rather they just decided to use other source. If units would be mixed, then rather others challenges would be wrong too. But well, to be sure, you would need to contact their support. Anyway they need to correct the badge or description.
Garmin support chat says that the correct value is 260km, 161.6 miles.
It's a four-point badge, and expeditions that are still longer (Rheinsteig, 320km; Camino de Santiago, 784km) are also four-point badges. And note that Mont Blanc Circular, 160km, is only a two-point badge.
It's kind of tacky that they changed it "in flight", especially since the lower value is justifiable, but... shrug. Nothing to get upset about.