"One or more of your words may not meet user guidelines and was removed"

I was trying to create a fun image for a friends Ultimate Frisbee Team. I kept getting the message that a word didn't meet guidelines and will be removed and then realized there was never a frisbee in the image. I've tried a couple different prompts now with the word "Frisbee" and found out this is the word triggering the user guidelines. I don't understand what is happening.