Flea-flicker Scoring Question

Hi folks.

*Someone in my league pointed out to me that Curtis Samuel finished last nights game with -0.1 in our standard league.

*He had 18 rec yards (1.8) , 1 rush yard (0.1) and had a fumble lost (-2).

*His fumble that he lost was not when he was on Offense, but when he was part of the D/ST on a kick return.

*He wouldn’t get 6 points for scoring the TD in standard leagues, so why would he get penalized for losing 2 points?

*I’v had a look through the scoring categories and can’t seem to find a way to resolve this, without turning fumbles off completely.

If anyone has a FF league and knows how to sort this I’d be grateful to hear your wisdom.