In doubt about scoring and stone removal

Can you please help me with this scoring? I have played many times but have never known what to do when the autmatical scoring is wrong like in this case (I suppose)

in the game

When its my turn to remove or mark stones suddenly the whole marked ones change into other colour. The idea is to mark all the territories again and let the opponent see if he acceptes or not?

Also I am in doubt about how to score this upper middle territory

thay i point in red. Its like two circles that cross each other with territory in the middle.

Thank you in advance for your answers. I don┬┤t care if I win or lose here, but would like to learn.

Have been explained by Flovo in the screen of the game. Thank you. Doubt solved.