Hi guys, long time lurker new-time poster!

Roughly 12 weeks ago, I got my navel pierced. I had a bit of a nightmare in the beginning with banging it etc, but after going to see my piercer and another highly recommended one, the conclusion was it was fine, albeit with hypetrophic scarring. This was when I had the piercing for 5 weeks.

But lately, i've been noticing more of the bar is showing, however, I was pierced with a 14mm curved barbell and I only need a 10mm bar? Could this be the issue?

Also, it is red and tender and I can feel the bar through it, however, I have been able to feel it since the 2 week mark.
Any help is appreciated, i'm wondering whether it is rejecting or migrating. I'm planning on going back to my piercer if it's still niggling at me, but I was wondering whether you lovely people could help? x

Pics included:

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Any help/advice is appreciated! x