Arcia-- should have an ERA in your park and league of low 4's, consistent with his career ERA. From his game log, you seem to be using him fine and your defense appears to be solid. This is a fluke.
Paez-- exactly the same as Arcia except he's barely thrown any innings at all. Teeny tiny sample size.
Butler-- same deal as Paez.
Guys that you put at setup will have bad records and a lot of blown saves unless you or simmy pitches them in the 9th a lot-- because if they do the job your closer gets a save (and they get a hold, which HBD doesn't record), and when they get hit they take a blown save and a loss. Look at their ERA and WHIP instead, and even then 2/3 of a season is a small sample size.