Can someone help me understand why just 2 prompts used 100% of my 5-hour limit?

Can someone help me understand what is happening? I'm building a website and hit my limit yesterday. Today, everything was reset, including the weekly limit. I asked Claude to continue working on the project so I could finish adjusting some buttons, and after it finished, my usage was already at 60%. I've been working on these buttons for the past 2 days, adjusting settings, sizes, artwork, animations, and other details, but it never consumed this much usage before. Some configuration sliders were missing, and part of the artwork was being cut off to fit inside the buttons, so I asked Claude to restore the sliders while keeping the artwork intact. That single request consumed the remaining 40% of my limit, and it didn't even finish the task. I haven't changed anything in my setup. Everything was working fine before the reset. I'm using medium effort with Opus 4.8 and tried to change to F@ble for the second prompt, no additional skills enabled, and nothing else changed. Does anyone know what could be causing this?