I have the same issue - happened after I chose to generate 4 ideas at a time. After that if I switch to just 1 it still tries to generate 4 ideas total where the first one is what you asked for and the rest is random stuff unrelated to the promp
I had the same issue, I realized I had an extra line without text so it would generate my initial prompt then move onto the second line, since theres no text it would just generate an incoherent image.
