What is causing this reflection on a surface? (Blender Guru coffee cup tutorial)

Question

I am following a beginner tutorial on Blender Guru’s YouTube channel.
I am creating a glass cup with liquid inside, and I am using the Volume Absorption settings on the Material panel in order to create the desired effect on the liquid.
As far as I know, I’ve followed the tutorial exactly, but as you can see from the attached image. There is some odd yellow/gold band as the top front of the liquid.
Normally, I would experiment with different settings, but as a complete beginner, I don’t really know where to go and what to adjust. With my extremely limited experience, I think it is something to do with reflections, as it looks like there is something else going on with that area, but I haven’t really got a clue.
Can someone please point me in the right direction?
Thanks.

Gareth Lewis · Answer

I think I managed to fix it. After experimenting with the scale of the liquid and HDRI and shading settings, I found out it was neither of these.
I hid the liquid by using the eye icon while in render view and I noticed the line was still there, and when I switched to object view, it still looked like there was a still a liquid shape. What I think I did was duplicate the vertices and right clicked rather than make a separate object. I then created a new liquid layer on top.
So what I did was click on the cup in Edit Mode and then Merge Vertices > By Distance. This effectively removed that additional liquid layer I had in the cup object.

What is causing this reflection on a surface? (Blender Guru coffee cup tutorial)

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