On force sesor manual analysis the sliders
If the A+B slider reaches the end to the right the relative position of A and B sliders change.
When A reaches the right limit the B and A+B keep moving.
Until all the sliders reaches the right limit. This way, if the protocol implies a fixed range, this range is lost.
I would be useful if it never changed when moving the A+B. An option would be to limit right and left limit by the point where A or B reaches the limit.