openlayers marker moveTo only accurate at a specific zoom level

I have been working on a way for users to move a marker without dragging. Basically, the user clicks on the marker and it opens the info window bubble. In the bubble is a link to a javascript function that sets a click event on the map. When the user clicks somewhere on the map it is supposed to move the marker to the point clicked.

In my map, I have 18 zoom levels. At zoom level 15, this process works perfectly. If I zoom in AFTER clicking once, the marker still moves to exactly where I click. But then, if I refresh and start over at zoom level 16 and try to click somewhere, the marker is moved to a position higher and more to the left. Repeating this process at higher zoom levels, the marker is moved even further up and to the left on the 开发者_开发知识库map (in distance).

Doing the above at zoom levels lower than 15 work just fine as well.

Here's a snippet of the code:

lmLayer = new OpenLayers.Layer.Markers("Landmark Creation");
map.addLayer(lmLayer);
var marker = landmark['landmark_1234'];// this just pulls the marker out of storage
map.events.register("click", lmLayer, function(evt){
    var pixel = new OpenLayers.Pixel(evt.clientX,evt.clientY);
    marker.moveTo(pixel);
    OpenLayers.Event.stop(evt);
});

I have console logged out the clientX and clientY clicks and they do register the right x/y coordinates from left and top edges of the browser. But it seems that OL is miscalculating the moveTo at the zoom levels above 15.

Any ideas?

a little workaround while waiting to bug correction

lmLayer = new OpenLayers.Layer.Markers("Landmark Creation");
map.addLayer(lmLayer);
var marker = landmark['landmark_1234'];

map.events.register("click", lmLayer, function(evt){
    var pixel = new OpenLayers.Pixel(evt.clientX,evt.clientY);
    marker.lonlat = pixel;
    marker.moveTo(pixel);
    // workaround
    marker.draw();
    lmLayer.redraw();
    OpenLayers.Event.stop(evt);
});

Cheers, J.