Using ERA in a small sample for a reliever is not the best way to talk about consistency. Yes, when you are charged with 4 runs in 0.1 innings like Ashby was yesterday and you pitch like 12 innings in a month, it's going to look terrible. You are in better standing if you want to argue that his June was not great, but from a consistency standpoint, July was actually really good:
He had 2 bad outings in the month. If your baseline is 0, you're going to be disappointed unless it's Mason Miller.