Drag and drop issue

whenever i try to drag a model or prefab into my scene onto an object it disappears but if i drag it into mid air it works fine. It's very frustrating having to put an object way away from everything else then dragging it to where i want.

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this doesn't happen to me. but i do sometimes start getting faulty errors when unity has been open for a long time. when things are acting funny, a simple restart of unity always does the trick for me