How to get rid of something strange in the Header of the TadvNavBar

VCL VCL Feature Requests
1

Hi,
with the use of the TadvNavbar I get this
image

Can you please tell me how to get rid of this?

Thanks

2

I have no idea where this comes from. I have not seen this before and I do not see this in our demos or test projects.
Could you please isolate this and send a sample source project with which we can reproduce this here so we can investigate?