Optimal Training load shifted down alot. Why?

Hi

When the optimal training load moved down alot it might be the moment I swapped from the vivoactive 3 to epix 2. But why did itdo that.

Now I'm in serious overtraining but a few weeks ago that would have been in my optimal range.

For info: The days my training went down I haven't been training because I have been sick.

Any ideas? My Bodybattery is at 98 today, my training readiness is ok, I get daily workouts suggested.

Everything else says ready for training. Just this page shows trainingload is far to high.