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The tree may have had twisted grain to start with and there may not have been much you can do about it. In this link you can easily see the twist of the tree in the photos. https://www.helpfulgardener.com//forum/viewtopic.php?t=33733 If the lumber is dried like Stick suggested it may dry straight but it is possible for it to twist later with humidity changes. It may do better if kilned as the heat softens the lignin and once the lignin cools it tends to stabilize to that profile if it got hot enough to start with. It is possible on larger trees to cut timbers and then angle the timbers so that the saw lines up with the grain but there are heavy losses in recovered volume that way. But it's better than nothing if you can't use it otherwise.
