[Indiana] Detective in my case didn't mirandize me, judge issued not guilty plea on my behalf.

I have a protective order case currently pending, when I was brought in for questioning on violating the order (original order stated nothing about returning to residence) the detective did not mirandize me on audio tape. I turned myself in as this is my first offense of any kind, upon having my first court date the judge issued a not guilty plea on my behalf. How do I proceed knowing this? Why did the judge issue that plea for me? From my understanding I should and could have been charged with a bigger charge but was not. Any advice while not being actual legal advice would be appreciated.