This is basically the defining feature of what researchers call a "locality-bound" poltergeist, and it gets overlooked constantly in favour of the dramatic stuff.
Had it myself years ago in a house in Matlock. Kitchen only. Never anywhere else in the building. Small stuff - a teaspoon, a lighter, a rubber band once which still baffles me. Always found within a metre or two of where it started. Never dramatic flying-across-the-room nonsense, just quietly relocated.
The room-specificity is the bit that should get people asking questions. If it were random energy or some psychological projection from a person, why would it respect architectural boundaries? There are some genuinely interesting theories around geological substrata and confined spaces but nobody wants to hear that when a ghost story is more satisfying.
What room is it in for you? Ground floor, upstairs, near any water pipes or old stonework? That detail matters more than people realise and nobody ever thinks to record it properly.