I have fixed the application!

Issues identified and resolved:

Bitstamp ATH Bug: Fixed a parsing issue where Bitstamp pairs (lowercase) were failing to fetch ATH data.
API Robustness: Added safety checks to prevent the app from crashing if an exchange API returns unexpected data (e.g., error objects instead of arrays).
Coinbase/Kraken Sort Order: Verified that the logic for fetching the latest Daily Stats is correct.
I verified these fixes with a debug script, and all 5 exchanges are returning correct data now. The app should be working smoothly again.