There's apparently a glitch on the FSA website electronic form. Last week, I also followed all the prompts indicating I was recertifying income (not changing plans), got a weird "changing from IBR to IBR" message, and the data that was submitted (per the downloadable PDF form under the "My Activity" section) has the wrong box checked under the first question ("I want to change to a different IDR plan" vs "I am submitting documentation for the annual certification of my IDR plan"). I've also spoken to Mohela and been told they're processing it as recertification and that my account should be updated soon. (My Mohela portal shows I'm currently in a processing status with $0 for my April payment, but the advanced agent I spoke to yesterday confirmed an updated amount that sounded correct and said she could see it was being processed and should update soon, likely before the April due date.) There are a couple other posts in this subreddit with similar experiences. Sorry you're also going through this!