Your’s is a “featured snippet”, which is where it highlights a relevant portion from a top result.
The AI results have the AI synthesize a new sentence or set of paragraphs answering the question using data from multiple sources.
They’re different results because you didn’t seem to get the AI search results. After making it available to everyone they’ve been hit with a bunch of weird results and have started scrambling to manually remove the particularly strange ones as they crop up.