Here is the proper wording.
“the winner of each round will [i.e. “must”] receive 10 points, (minus any points deductions for fouls) with the lesser score awarded to the loser of the round (minus any points deductions for fouls).6 There are to be no fraction of points awarded, and in the event of an even round, the score will be 10/10. Even rounds should rarely, if ever happen.”
The "Even rounds should rarely, if ever happen" is an ABC guideline in the referees and judges certification process,it doesn't appear in the rules of either the WBA or WBO.
Regarding how rarely they should happen, they should and will happen from time to time if you're being totally fair and as such there is always the probability that more than one will occur in a single fight.