That's not the main problem. The drivers often pull in sufficiently for the steps to be quite close to the kerb, but just not quite far enough forward and just not quite straight enough to prevent the very rear corner of the bus protruding into the traffic lane, when there is usually a bit more space ahead of the bus in the bus-bay that the driver could use.
On a dual-lane road, it often causes drivers in the inside lane to veer slightly into the centre lane to be sure of clearing the bus, further disrupting following traffic.