[Assumption: we are working in map view]
If you drop a selection of notes into a container, Tinderbox will retain the relative layout of that selection when added to the child map. However, when you 'blind' drop a selection to a child note, Tinderbox has to place the the dropped note(s) without overlapping existing content. If there are no child notes (i.e. the drop is creating a container from a note) then, usually (I believe!) one or more of the dropped selection will likely be visible in the viewport - how many will depend on the horizontal/vertical spread of the selected items being dropped.
If the child map already contains children (the drop target is already a container), the dropped selections are fitted into the child map in/around existing items in the viewport. I suspect the issue you're seeing occurs if the drop occurs into a container from a view other than map view. In that case the dropped (notes) map be located away from the parent map's container's viewport. IOW, when you switch back to map view the dropped items aren't in the container viewport as you expected.
There're isn't a built-in mechanism to do what you ask but an $OnAdd action in the container might help. Not tested (busy at a conference right now) but this suggestion works on the fact that when notes are dropped in a contain, they are added as the first sibling(s) child(ren) of the target container. Sidenote: in views like Outline you can manually drop to a particular place in the sibling order - I'm assuming you don't do this). Thus we set a action that on adding content we set the
$MapScrollX and
$MapScrollY to the
$Xpos and
$Ypos of the new first child note):
Action: $MapScrollX(parent) = $Xpos+1; $MapScrollY(parent) = $Ypos-1;A quick & dirty test with a 2 note selections with some X/Y map separation, dragged in Outline [sic] view onto a container result in the map view of the container showing one of the dropped notes. Oddly, the note in view is the last (second) item in the selection; not yet sure why, I'd expected the first to be in view. But, it gets close to what you want, or so I think. Hope that helps

Mark B may well have a better answer!