Read across predictions in Toolbox are based on the five closest analogue by default. Sometimes, when there are two or more analogues with same logKow value,the number of analogues used for the prediction could be higher - six, seven, etc. This is the correct number of analogues used for the prediction. However, in the report in section 4.2 is written the default number, i.e.that the calculation is based on five closest analogues.
In order to have same number of analogues in the report, you should increase the number of analogues used for the prediction.This you could do once at the Data Gap Filling - open "Calculation options" and then select "Prediction approach options". Once there, increase the number of closest analogues from 5 to 6 neighbours.