Base runs being recorded as Tempo

Firstly, I’m running the latest version on my 965. I have:

- LTHR = 169bpm

- Max HR = 196bpm

- Zones based on %LTHR

- Auto Detect for Max HR, Threshold, FTP

just diid a 2hour base run with average HR @ 149bpm. The suggestion was 146bpm. However instead of being recorded as base effect it had been recorded as a Tempo run. I find this happening a lot. Can anyone explain why and if there is a fix please? I’ll post my graphs below for your perusal. 




If there is any other information you require that might be helpful I’m happy to provide.