Board Thread:Moderators/@comment-61022-20160511151553/@comment-4651179-20170623200116

Besides the point, as per the original indica, however, each ongoing series was published as Vol 1, 2, 3 etc. I would presume that Deadpool Vol 3 #25.NOW being listed as Vol 4 was likely a typo especially considering all issues around it were listed as vol 3.

I haven't checked the indicias for Deadpool Vol 3 issues, but I highly doubt the thing in the #25 cover is a mistake, especially taking into account that there are reasons to consider said volume the actual Vol 4.