I updated the app to get Energy bank and I noticed a couple of things.
When I had RMSSD setting for HRV readings my Energy Bank showed 6%, after I switched to SDNN and reload Energy Bank it shoed 44%, then I switched back, reload and it was at 6% again. Then I once again switched to SDNN and my energy bank was at 31%. Then again to RMSSD and it was at 6% and once more to SDNN and now I am at 41%. So different number under SDNN every time. I made a reload every time.
Another thing I noticed is that apple watch app is showing 33% in Energy Bank under SDNN all the time.
And all widgets are showing 10% if its set to SDNN. Under RMSSD all widgets are showing same value as in app - 6%.
Pictures attached are all from my last setting under SDNN.