The prompt may not be explicit enough about it looking like IKEA.
This looks like something from the 70s. Which makes sense, since Midjourney likely assumes a connection between bomb/fallout shelters and the Cold War.
So far, the public ones are often like a first-year student's impression of X -- it nails some aspects (symmetry, color palette, or framing), but others completely elude it (object-object relativity like "zippers go on clothes, not skin" or intentionality behind object choice).
What's fascinating now is which things are picked up on (e.g. 70s) and which are ignored (e.g. specific IKEA furniture design style).
And then how that's reinterpreted by viewers -- "Looks great!" vs "Misses A & B!"
Which to me makes the whole system an autoecoder for ignorant people (in the not-knowing, not pejorative sense).
If Midjourney can create an image that will be attractive to people who don't know furniture design, and 90% of people don't know furniture design, it works for meme purposes.