Hello,
Look at the photos below and Tell Me why the numbers are so different? Can I somehow correct them manualy?

I get a similar display when using two Garmin devices one for running one for cycling.
It seems they are both reporting different LTH for running and cycling which makes sense, but Garmin Connect cannot display correctly.
I have the same problem, and I only use the 945, no other device. Today, for example, my threshold has improved, but 945 has not updated the threshold. I hope they work out.