ChatGPT Prompt Help

I am fairly new to ChatGPT and am having some difficulty generating a prompt that the ai follows, despite what feels like very specific instructions.

Prompt:

Create a printable kids’ math addition worksheet formatted for standard 8.5 x 11 inch paper. Include: • A fun title like “Addition Practice” in large, bold, rounded letters at the top. • Cute, varied doodles around the title (e.g., butterflies, rockets, stars, clouds, animals, or smiley shapes). • Lines for “Name” and “Date” just below the title. • 20 addition problems arranged in 2 neat columns of 10, evenly spaced for easy writing. • Each problem should have two random addends, the first between 1 and 20 and the second between 1 and 10, whose sum is 20 or less, formatted like “8 + 13 = ____”. There should be no repeat problems. • Clean, black-and-white line art style suitable for printing. • A cheerful, child-friendly design with a white background, legible font, and balanced margins for easy cutting or stapling.

Can’t attach image.

My specific issues are that there are clearly 22 problems instead of the 20 requested and there are multiple repeats despite specifically requesting no repeats. I am uncertain what the problem is. Please help.

TIA