I think I know what the problem is, your acc is probably saved on your tanki. To solve that you need to click the X on the top right of the page and then try doing your account afterwards

Once when i gold box falled i saw it fall right on me and I found that all the other tanks turrets were spinning and then with out me knowing I was destroyed while i was lagging and someone else took the gold box which was on the other side?? How could that happen on the other side. I was in silence.

I agree B)