No, it's 25% total, unless your State has a stricter or more liberal law. What state are you in?
If you get more than 1 judgment, then the others will have to wait until 1 at a time is satisfied, unless they choose not to go for the most they can get.
File a Motion to Vacate Judgment due to Improper Procedure after you find out which court it was filed in. Ask your County Court for the instructions.
I realize you said AZ, but I am not clear if that is where you live or only where the case was filed... At any rate, it would be through a county municipal court anyway, so you need to find out exactly which one and file that Motion with them.
Here are AZ garnishment laws: "http://www.fair-debt-collection.com/state-garnishment-laws.html#4"