Looks like we have been paid out twice, and it seems we are not alone

Two efffects that I know of:

"A team’s morale contributes SL to DEF and OFF area stats.

The morale is multiplied by 10 and rounded down to two decimal places.

e.g. 0.72385 morale * 10 = 7.2385 rounded to 7.23 SL, which is added to DEF and OFF. The morale bonus is not used to increase this figure."

"Ticket Revenue

Most of a club's income comes from ticket revenue; a club gets a certain amount of income from ticket revenue for every match in which it plays. The amount earned in each match is given by the following formulas: Home morale = morale + morale bonus Visitor morale = morale + morale bonus Normal Match: Gate = 60k * (1 + (2 * home morale) + visitor morale) Neutral Match: Gate = 60k * (1 + (1.5 * home morale) + (1.5 * visitor morale))

Ticket revenue is split evenly between the two clubs involved, and is detailed in the match report that you receive after the game. Club morale is a number between 0 and 1 as described below."

So, in your example, a difference between 0.5 and 0.8 is going to be the difference of +3 OFF and DEF for the first part. For the ticketing revenue, it depends on if home or away, but will average out to 27/2 = 13.5k extra per match.