Matters not always being properly associated when logging in Clio

When selecting Log Call from the list of Calls, I will always see Contact, Activity Title, and Note.  Intermittently I will see Matter, which allows me to select any of the Matters associated with that caller, or None.  Usually Matter is not listed at all, even if the caller has an associated matter.  In another case, Matter was listed and call was logged, but when I went back to that call and selected Edit Log, Matter was no longer an option.  Am I missing something or is this a known bug?