The Fortune bug is known but, I've never heard/seen anyone spawning under the bedrock.
Popular Minecraft YouTuber silentwisperer reports on the Fortune bug in this video: https://www.youtube.com/watch?v=47X9_twQV40&t=131s
The timestamp for the Fortune bug is at 1:01
That is very funny. I don’t believe it’s a bug though.
In Minecraft on the title screen, go to Settings > Profile and see if ‘Only allow trusted skins is off’. If it’s off, then all custom skins will look like Steve. So try turning it on if it isn’t and see if that’s the issue. If not, then I don’t know what is wrong unfortunately.