Illegal Repeat

I have a huge problem. I took the AP test for English my senior year for high school and I got a 3. It’s passing for college credit. I never knew that my credit had gone to my college because when I checked on my college portal it wasn’t there. The lady who was helping me pick my classes told me to take English then. I got a GPA of 2.35 this semester. I check my portal again and it went down to 1.9 and now I am on academic probation. I’m panicking because they said the English class I took was an illegal repeat. I’m just really wondering if they can take off my AP credit off my account and just let me get the credit I took for my English class here in college.