JDK-8-Build-b121:

package com.sun.javafx.collections;

public class ObservableListWrapper<E> extends ModifiableObservableListBase<E> implements
        ObservableList<E>, SortableList<E>, RandomAccess {

....

line 159
    @Override
    public void remove(int fromIndex, int toIndex) {
        beginChange();
        for (int i = fromIndex; i < toIndex; ++i) {
            remove(fromIndex);
        }
        endChange();
    }


I guess the remove() method should be called with "i" rather then "fromIndex" parameter.