An update to the problem: it is a conflict between I18N CustomFields and I18N Special Pages. I tried removing CustomFields to get around it, but that ends up breaking many of my pages and stops displaying the content. Still not worked out a solution as of yet.
*edit* It is definitely something about having CustomFields and Special Pages. When I disable CustomFields, the creDate field is left untouched as it should be, but the content of my Special Pages stop being displayed properly. When I renable CustomFields, my content is displayed properly, but the creDate field simply takes the value of the pubDate field, making it entirely useless.
*edit 2* I've realised why my fields weren't displaying (hadn't transfered the template correctly to say special_field instead of custom_field, so I can delete CustomFields safely now. Hopefully this fixes the pubDate/creDate issue. Still, a very helpful feature would be to fix the template files for all of a special page type with one button (one I suggested before), since I now have to edit the xml files of over 50 files xD
*edit* It is definitely something about having CustomFields and Special Pages. When I disable CustomFields, the creDate field is left untouched as it should be, but the content of my Special Pages stop being displayed properly. When I renable CustomFields, my content is displayed properly, but the creDate field simply takes the value of the pubDate field, making it entirely useless.
*edit 2* I've realised why my fields weren't displaying (hadn't transfered the template correctly to say special_field instead of custom_field, so I can delete CustomFields safely now. Hopefully this fixes the pubDate/creDate issue. Still, a very helpful feature would be to fix the template files for all of a special page type with one button (one I suggested before), since I now have to edit the xml files of over 50 files xD