Re: Hump in the floor - Truss pushed up
I think you may find that the door frame (was this just the jambs or also the stud/frame that held them?) was supporting that joist (or are we actually talking floor trusses?) and with that extra support, it is the only one of the set that did not (was not allowed to) settle/sag. So you are only perceiving a "high spot" because it's the last joist standing in its original position, while its partners have sagged to either side, with no additional support.
In any case, whatever the cause, it is a very hard problem to address. I can think of two solutions; remove the plywood subfloor over a significant area, plane down the top of the joist until it's level with the rest. OR sever the high joist entirely and things will settle down pretty fast, if they need more convincing, pile concrete block or sandbags above until it seems flat. Then sister the old joist with a new timber and plenty of fasteners as appropriate, etc. This is _not_ an option if in fact we are talking about actual floor trusses, using your terminology. Trusses cannot be modified in the field, but planing a small amount from the top chord while not ideal is probably acceptable if it's not too extreme. To sister a truss you would need an engineer-stamped drawing or you would be looking at a failed home inspection down the road. Unless it was so well buried under finishes... just sayin'.
Remove not the ancient landmark, which your fathers have set.