Sorry if this happened to you.
During the last app update, some users encountered an issue where their list was merged into another list. Unfortunately, yours is one of them.
More context here: Clear 2.5 with Cloud (iOS Sync & Web) Beta - #27 by phillryu
We are working on an urgent fix and will send you a test flight build link that lets you restore from your iCloud backup. Please hold tight and don’t do anything else now.
Also, so we can track you, please email us at clear@impending.com to send you the build link.