Training effect totally wrong

Hi,

I just finished an easy long run and get as a result: Threshold run.

Training effect: 4.5 aerobic, 1.6 anaerobic. Excercise load 272.

Which seems far from the reality and throws off recovery time, training load, training status....

HR zone setup in garmin: LTHR 160 bpm, max HR 174, resting 52bpm.

My threshold speed is about 4'20"/k

Longrun stats:

1h40 minutes total,

avg HR 129

max HR 139

avg pace 5'31"/k

max 4'51"/k

Which is all far from threshold.

Any idea what might be the issue?

One remark: I have a Stryd as footpod, and a Polar H9 as HR sensor.