Series Unsuccesfull after playing just one game

I have been screwed over by LP Loss more often, I'm in a place where i lose 25 and gain 16. But even with all that I finally managed to get to Gold IV Series, but after losing the first game it instantly said Series Unsuccesfull. Now that is completely unfair! What can I do to solve this? Or do I just have to take this from Riot ?

[Edit for screens} You can see i have won 3 then lost one. So it's impossible to have lost a best of 3. And in my League I dropped 3 (thus dropping from the promotion tier) Solid proof the rank system is totally flawed.