I do not have lone wolf. My friend had lone wolf and did a respec but afterwards we discovered we could only have 1 companion even though neither of us had lone wolf.
We were like oh well guess you may as well grab lone wolf again since you can't get a companion, so he did but then that made my companion disappear and now we can't have any companions.
So to summarise: respecing does not remove the -1 companion slot from lone wolf and getting lone wolf again after respecing removes ANOTHER companion slot for a total of -2 from just one character with lone wolf.
We can't really continue until it gets fixed