I saw this with an older version of WordPress. I have not seen it with more recent updates. You fix is to update, honestly. This should be the least of your reasons to do so.
Without updating, the only way I was able to sort it out was by editing the (if I remember correctly) screen_layout_* key values in the *_usermeta table using PhpMyAdmin, in my case. I should stress that that was a hack to get by until I updated. It isn’t really a fix. Caveat Emptor.
Also, update.
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