What Bikeworkshop said.
But more likely what others have said, you're missing a thin shim washer somewhere under the freehub body, and tightening the wheel has put a side load on the inner race of that bearing. Plenty of vintage CNC hubs such as the Supereight or Nukeproof hubs utilised very thn shims, but finding them now may be a problem.
OR, the bearing is knackered. Try replacing that first, PROPERLY, loading the races correctly when pressing it together so as not to damage the new bearings. All being well, the bearings should be a pretty tight press-fit on both the hub shell or freehub body, and onto the axle.
Item 10 here is called "adjusted washer"
https://www.eshop.novatecwheels.eu/Data/2766/UserFiles/Drawings_3D_explosion/818SB_v25.jpg
There is a reason stuff like this exists (looking for no brand in particular):
https://www.ebay.co.uk/itm/13595549...mkcid=28&google_free_listing_action=view_item