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This has been happening for years but today it's worse than usual. I went to edit my subscription and found dozens of subscribed channels I never chose. Why does this keep happening? (My client - FreeGuide - allows me to filter the channels so I didn't notice it until I wanted to add a new channel.)
The SD-DD service (and Gracenote's Data Direct service before it) always auto-added new stations. I seem to recall Gracenote's service also had some bugs where you could get stations that no longer existed. (they wouldn't be removed from your lineup when they went away.)
For SD-DD, I only store stations you manually exclude. So new stations automatically show up when they are in the upstream lineup.
This is how it's always been, but some application or grabbers allow you to ignore new stations. I know tv_grab_na_dd and MythTV can do it. I'm not familiar with how Freeguide gets the data.
If you're seeing lots of new stations, it usually means your cable company may be in the middle of a shuffle.