I think you're over reacting, to put it politely
You're talking about technical stuff like 'defined values, numbers etc', yet you're failing to make a point.
I don't know if i'm going against forum rules here mentioning another game, but Sega FM14, which is generally accepted as a 'True Football Manager Sim' has the same situations of random results.
And yes, there is some unexplained randomness showed by the game engine, but I don't think the situation you posted warrants any particular outrage.
Perhaps we can form some better deductions if you posted HOW the goals were scored, and factors such as the post match player rating etc.