Launched the current release here, Cleared Unused Cache Files, then for cache location browsed to a TEMP folder on a different SSD drive.
After closing VP, relaunching and loading a project, all the cache files were on the SSD. None were at the former default location.
So cannot replicate your findings here.
Don't recall mention in the forum of "hidden/phantom/orphan files underneath other files." From the description, echoed in your other recent posts, it's difficult to envision exactly what is taking place. But if If this were common, there should be other reports.
When <shift> is held down while rearranging clips, it prevents snapping to the precise joint between clips, making it easy to unintentionally fragment the clip at the drop point. This may be what you are experiencing.
Don't use <shift>. When shuffling clips on the timeline, or dropping/inserting a clip from the bin, the right-facing chevron will snap to the precise joint between the other clips. Or use these 
to locate the joint, then right-click on a bin clip to PLACE CLIP ON SEQUENCE AT CURSOR.
Drag_drop.mp4You might also select all clips to the right of the intended drop point, then drag them right - to create a gap. Then move the desired clip to the gap and CLOSE GAP, via the right-click drop-down menu.You might also select all clips to the right of the intended drop point, then drag them right - to create a gap. Then move the desired clip to the gap and CLOSE GAP, via the right-click drop-down menu.
An alternative is to select all clips to the right of the intended drop point and drag them right - to create a gap. Then move the desired clip to the gap and CLOSE GAP, via the right-click drop-down menu. No need to group.
Gap.mp4
