[Gmap] 'Node locations' centering + location node macro + marker issues

Hi all

Dying to find a solution to a few of these problems. I've just created a Gmap + Location setup. I now have 'User Locations'. And 'Node Locations' on the left - each showing all the contributed node locations.

1) However when I view 'Node Locations', because I've added a node location already (a content type); it isn't displaying my Center point that I set in 'Gmap Location' under 'Site Configuration' correctly. It sort of shifts the map a bit to the right so that the 1 node location I added has its marker more toward the center of the map.
'User Locations' shows the correct center point because there aren't any user locations added yet. So what can I do about this? It is changing the center point or position of the map on 'Node Locations' according to the Node Location markers present.

2) Where/how do I edit the Gmap Macro for the actual Location Node? i.e. the content page with the Location and marker showing on a Gmap - i.e. a typical Location node.

3) When I'm adding a new Location node, if I don't drag and drop the marker to select a position and instead I click on a spot on the map, it then tends to... PUSH the map far to the right, out of place and nowhere near where I clicked. What's the deal?

Thanks to everyone that helps, I'm relatively new to Drupal, still finding my footing! Glad to have found this groups site, I will update this thread as I encounter more problems.