I have previously reported a bug/limitation that when duplicating a bible passage and changing the range (in order to retain the formatting across slides) the redundant signal (of the previous passage) is retain resulting in a chain of unnecessary and irrelevant signals.
I have also noticed, however, that, on occasion, the wrong signal is randomly attached to a verse as per the screen shot below,

There is no reason why SoS should be attached to this passage as we have not used this passage elsewhere in the service. Stranger still, there is no way of deleting the signal in question. I have tried redoing the verse (1 Corinthians 9) from scratch, but SoS is still there. Immovable.