Duplicate entries in Apple Health

I am on iOS 11 with the latest version of Garmin Connect. When looking in Apple Health I see lots of duplicate entries (same time and duration) from Garmin Connect in my activities. A quick Google shows people were having this issue back in 2015 but I've not seen any simple solution to stop it from happening and it is becoming more and more irritating.

I know Apple Health may not be the best application but I use it as a central repository.

Does anyone have a simple solution for this (other than buying an Apple Watch and using a Wahoo Tickr with the watch).

thanks

Alex