Spotify, Add to queue feature, sometimes it doesn't add the full song?

[BlueBlueGreenBlue]

Sometimes I use this feature to listen to a particular song several times in a row.
Occasionally it seems that if I do it halfway through the song it will only add the remaining half of the song to the queue.
Does anyone else experience this?
Sometimes it seems to work fine and adds the whole song to the queue.

I haven't found this - but did you know there is a "repeat one" setting? So you don't need to add the song to the queue to listen to it on repeat.

Thanks @BertieBotts I didn't know that, Very useful