Chosen Solution

I just replaced my screen and display of my iPhone 11 after it was damaged. Everything on my phone works perfectly normally. The only issue is on my front microphone, the audio is all jumbled and indistinguishable. I have to use headphones to take phone calls or use the speaker so the audio comes through the bottom of the phone. Any ideas on how to fix this issue?

if you swapped over the front flex was there a sticker covering the speaker mesh on the back of the screen ?