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Constantly getting new personal records

I noticed recently that both my Garmin Forerunner 735XT and Edge 520 have started giving new personal bests nearly every time I ride/run. For example: 

A few days ago I ran a 5km PB, and post run received new PR’s for 1km (3:23) 1 mile (5:38) and 5km (18:45), which were correct. I then ran the next day for a recovery run, and got a new 1km (4:34) and 1 mile record (6:50), which the times are correct but clearly aren’t PR’s. 

I have no idea what’s caused this to start happening, as in the past I’ve never had issues. Potentially an update to Garmin connect that’s not syncing/clearing my PR’s every time I run?? 

Has as anyone else experienced this before?