There are a few histories associated with your account at Galaxy main (https://usegalaxy.org) that are deleted, but not permanently deleted. These are contributing to your account's quota. I recalculated as administrator and the 32.5 GB size is correct.
Go to Saved Histories > Advanced Search and set status = all to review and perm delete those histories not wanted anymore.
- >> Checking for active vs deleted vs permanently deleted (purged) datasets and histories
Thanks! Jen, Galaxy team