ALThold strange behaviour

Thanks @hosein_gh
Does that mean if THo is higher in the Graph than ALT and DALT
The copter is underpowered ?
And if it is below it is overpowered?
Or how can you Interpret that?

Can we compare the THo with the real Alt which is from a distance Sensor? RNGFND ?

no , THO is relative to ALT and DALT but not this way
if THO was maxed, then copter loosed altitude or can’t hold ALT same as DALT its meaning that your copter was underpowered