Front camera quality turned bad after Glass + LCD Replacement

So I recently repaired my iPhone 6s+ after the screen cracked. I ordered the glass + LCD replacement kit from repair parts plus and everything was great. I transferred over all the small parts from the old screen (including the front camera) to this new LCD. After checking the front camera, however, I see that the quality is not as good as it was before. It's useable, but looks like an Android quality front camera; can't capture details. The quality gets worse with front flash. I've opened up the phone again and made sure everything was how it was supposed to be, and even gently cleaned the camera once again. There are no scratches on the camera, it looks brand new. Id really like to fix this issue and get the good quality back on the front camera. The only explanation I can think of is that maybe this new replacement glass isn't perfectly clear or maybe the diameter of the transparent circle over the front camera is a millimeter too small. Please let me know your thoughts!