Re: Header + image problem after upgrading 6.3 to 12.3
One thing I see right off the top... your site includes a custom line of CSS:
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#sitelogo img {margin-top: 0; position: relative; top: -12px;}
However, starting in Tiki 12, the #sitelogo ID was changed to .sitelogo class. Please see the release notes for this and other theme-related changes.
Additionally, the Custom Code aea (that you used in Tiki 7) was removed in Tiki12 and converted to a simple module. For complex coding (such as what appears to be in your case, but I can't tell for sure), you'll need to rework the styling for the heading, especially since the theme-based heading TPLs were removed. Please see the Module Revamp docs for details, especially the "Theme Compatibility" section.
HTH,
- Rick | My Tiki Blog | My Tiki UserPage
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