Run in debug mode and review the log.
It could be that the sources you have enabled, do not have the title
OR
Those sites recently changed their web page layout.
Calibre scrapes pages using a template designed specificly for those pages.
If you fing a metadata source that Manually works when you visit, but does not when the metadata search using that site runs. Report here, the site that no longer works. Kovid and crew can't fix what they don't know is broken
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