yah, for canon cams, if u on/off, it will trigger the static charge to clean the sensor... this may have moved the dust or fur to other parts of the sensor.
the dust is not mobile only when it is wielded to the sensor, then u will need to use cleaning solution to clean instead of blower.
It could be that the camera has the anti-dust feature which shakes the sensor. This can cause the dust to shift around sometimes, without being removed.