The screenshot looks "correct" to me, you only typed the keyword, without specifying a search string, if you confirm that it should go to www.allmusic.com/search. keywords can be used as url aliases, even if that feature is sort of deprecated. We only show the domain for keyword and that makes it confusing in the empty string search, we should change that to show the full url. If you add a search string, like "allmusic something", then it should show "www.allmusic.com: something" and search for something in the url. The different behavior across profiles could maybe be related to bug 1584545?
Bug 1584606 Comment 4 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
The screenshot looks "correct" to me, you only typed the keyword, without specifying a search string, if you confirm that it should go to www.allmusic.com/search. keywords can be used as url aliases, even if that feature is sort of deprecated. We only show the domain for keyword and that makes it confusing in the empty string search, we should change that to show the full url. If you add a search string, like "allmusic something", then it should show "www.allmusic.com: something" and search for "something" on the website. The different behavior across profiles could maybe be related to bug 1584545?