Bug linking a slider to a combo box using referTo()?

Hi, so I’ve linked a slider to a combo box using referTo() and the combo box always receives a value decremented by 1 when it updates.

e.g, set slider to 0, combo box receives -1, set slider to 100, combo box receives 99.

Likewise, settings the combo to the first entry (0), causes the slider to get set to 1.

Exact same code works for sliders and buttons, so combobox seems to be aberrant.

Anyone else tried this and experienced similar things?