Kitchen units.

l am fitting new base units and wall units in the kitchen and the units have markings to say where the hinges fit , anyone help me out here.
Also the drawer fronts are the same, l've had a go at the drawer but when it's closed it seems like it's catching something on the runners closing , maybe the screws but l've fitted the correct ones, and when closed it does not close flush to the unit.
The top of the drawer closes nearer the unit than the lower part and l've adjusted on the side of the drawers but makes no difference..
Should the front of the base runners be flush with the front of the units as that is where l positioned then.
I got no instructions with the units so l'm asking for some advice off people who know ..

photographs please, inside the cabinet, showing the drawer runners on both sides and where they are placed.

also pics of the sides of the drawers showing their part of the runners and the front of the drawer

and of the drawers when in their "closed" position.

It may be that a part is misplaced

Look for a name on the drawer kit. they might be Blum/blumotion or Hafele, which are very common, or some other make.

Should the drawer runner be placed 2mm in from the front of the units as
l have placed them all flush to the end of the units.

mine are, but they might be different from yours.

Pictures and brand are needed.