Ace: Ace Marker at wrong position

Hi

I'm using ace 1.1.5 and got some problems setting markers

i want to highlight some rows. for this i add markers with the following code

var range = new Range(4, 1, 8, 1);
var marker = $scope.editor.getSession().addMarker(range, "ace-related-code-highlight", "line");

my style is :

.ace-related-code-highlight {
     background-color: yellow;
}

But ace highlits the first rows s. ace1.png. i f triger again the exact same code with same range it highlights the next rows s. ace2.png

I found out that he always respects the highgt of the range but starts on top. in de example above he highlights lines 1-5 . second click 5- 10 and so on.
But on scrolling the range moves. some times line 11 is marked and sometimes line 10 is only halfmarked.
so it looks like ace hase some problems with finding the right line ?

Also when sometime when i scroll i get some rendering errors . Only the left part is yellow not the whole line s.ace3.png

any advice of what I am doing wrong?