On the far right is the Welsh Red Dragon (or the Y Ddraig Goch, if you need to clear your throat), flying next to the flags of Japan, China, and the United States. That wouldn't be there in our world. Wales is part of the United Kingdom, which is represented in the UN by the Union Jack. But the UK's flag is nowhere to be seen. Wales has usurped its place. To use an American analogy, imagine that instead of the Stars and Stripes, it was the state flag of Wisconsin up there. What the hell happened to cause that change?
The United Kingdom is the world's fifth-largest economy, and here it no longer exists as a single entity. Did the MCU have a Brexit built on the fear of Sokovian immigrants, and it went so badly that the country just broke up? And somehow Wales came out of the mess as a major power? Is there a Welsh equivalent to vibranium? Is there a super sheep serum?
The other likely factor is external. If you can think back to your vague memories of Thor: The Dark World, London was attacked by a magical sky beam created by Generic Marvel Villain #14-B. And somehow, amidst all the quipping and special effects, that attack devastated the city to the point where England is an afterthought on an island led by the Welsh. That would be the biggest shock to the international order since the collapse of the Soviet Union. The MCU must be radically different in all sorts of weird ways.
Or it was a set design error and means nothing. But our version is way more interesting.