Same sail numbers

Recently entered results for the Symmetric Grand Prix at Rutland - my first
time using Sailwave in a non club race. In club racing you get to know who
is who and the different sails they use. A problem arose.

The results as they came in had 3 sail numbers 275.

1 person had signed on as 275
1 person had signed on as 889 but with a spinnaker number of 275
There was no 3rd 275 signed on.

When we entered the results we did not immediately pick up the multiple
number and neither did Sailwave - it overwrote the result with the new time.

Is this what you expect should happen or is there some way of getting it to
tell you that you have already entered a result for that sail number?

Many thank