Either there is a crack in the wood, or, more likely, the neck was subjected to stress at one point and got those. A weather change causing a neck bow at some point in its life?
Clearly you need to have a tech check it out, confirm there's no risk with the wood itself, and that the cause was something like I made up above.
Good luck.
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An old Gibson and a couple of old Martins; a couple of homebrew Tele's
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