GK always in low form even when team defend well and not concede any goals

[Nguyen Vietanh]

I not sure why but my GK always have form 5 in 8 matchs recently, he even have a few 3 and 4 no matter what happen in the game.
Somehow I think this is a bug since if he not have much work to do in match he should get at least 6 not 5 as a GK.

say for an example I have 3 last matchs win at 1:0, 2:0 and 4:0 but in all 3 matchs my GK form is 5 and in his league form record it is 4-5-5-5-5