Long joist is applied.
Floor joist crown.
Not enough for concern.
The joists that is cut will stay crowned unless acted upon by an outside force though it may drop a teensy bit.
I have full access under the joist a 2x12 with a full basement.
Take a look in the crawl space to see if anything is forcing the joist up beam stub wall.
Then use screws to draw down the crown then set the splicing joist in tight.
You need to make sure the hump in each floor joist is pointing to the sky.
If the crown is less than about 3 8 you can just sand it down with a belt sander.
They sure don t build them like they used to.
Joists that have severe crowns need to be set aside or some of the crown needs to be trimmed off so the floor remains fairly flat once covered with plywood or oriented strand board.
Between it and the end joist just 12 inches away there was a 5 8 inch drop.
The joist on the other side of the crowned joist was properly level meaning it was in plane with the end joist.
If it s really bad you might have to pull the sub floor and plain down the joist but that s not much fun.
This is a crown.
I am retiling bathroom floor and have a very noticable crown on one joist the other joists all appear level.