I remember a previous bug that all the manual observables (specified in the rml) are in error value, while the automatic observables (set with observable="all" option) are correct. This bug was solved previously. Can you try with the latest commit on v2.2.13_dev?
For the problem of observable sequence, It is actually not a bug. It is because that all the manual observables are added before automatic observables. This related to the observable adding logic, and I think it is normal.