This might be caused because you have tried to move your custom meta box to some place and WordPress respects the user’s ordering/positioning of these boxes. You can do as gmazzap has told because this will create a new user with blank preferences.
Or you can login to your database, find DBPREFIX_usermeta
(DBPREFIX
is your database prefix) and find related database entries. In my case:
You can see meta-box-order_PLUGINNAME
(where it is your plugin’s name) and screen_layout_PLUGINNAME
. When I removed these entries, the problem was gone.
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