If a Witchdoctor companion or pirate has Readied Spell 2 or 3, It will no longer activate 2 spaces away from you like Overwatch does, it will activate depending on how far your range is. For example, my pirates' range is 7 with my wand, so my Readied spell only activates from that far away. Or Carcarius Grimtooth, who has a range of 3, so his epic only triggers 3 spaces away.
Is this a glitch? If I recall, it was the same thing with Overwatch back in the day, but they changed it so that Overwatch 2 and 3 would still activate 2 spaces away. Did they just forget to change Readied Spell as well?