Mission table - mission % success

[Vesenka]

Hello,

I have started mission obtained from treasure map, simple mission, countered all enemies. At the end I have ~150% mission success. But when mission ended, it shows -50% to success and of course failed.
Today I have send some other mission, and I saw, that % is not calculated correctly.
E.g. at the morning mission with ~130% success, I have check it in mission progress tab and it shows -25% change.
Is any one have same problems? Or maybe I'm doing something wrong, by sending only champions?
Or maybe % calculation not work properly?

Thank for answers.