I've mentioned before that you can set up multiple privacy zones in Strava, based on postcodes or street names, so that you end up covering much more than the 100m or so that a single privacy zone will cover.
However, I found a reference yesterday on another forum to a "known" bug with this functionality in Strava. Apparently, you can set up multiple zones in this way and everything looks fine when you view them yourself, but sometimes only the last one you created will be effective for other users.
The bug is when you have 2 (or more) privacy zones and your ride starts in one, leaves it, enters the next one, then returns to the original/possible 3rd zone. At this point the bug kicks in no privacy zones are shown at all on your ride to anyone.
It's a problem for me because I usually just pause my Garmin when i arrive at my parents home or college and continue the ride when I leave to return home. The result is that I've taken the privacy zone off my parents home (it's like fort Knox anyhow) and pause my just prior to getting to their home.
(The alternative is to record it as 2 rides but I don't want to do that)
That said, I only list my bikes as road bike, old road bike, mountain bike, tourer and I also don't have my privacy zone set to my postcode, but the centre of the village with a 500m radius.