Board Game Arena

Hi there

I am definately doing something wrong in the solo, but I read abd calculated about 100 times, and still cant figure out what I'm doing wrong.

Round one;
Legend has 7 mythical, 5 yellows, 4 greens, 1 blue and 2 purple.
Bga counts: 18 points.

If I follow the rulebook, that would be;
12 Colored Stones = 12 points
7 mythical = 14 points
Total 26.

I thought maybe mythical where taken along and not counted, but that also doesnt seem to be True.

Please can anyone explain what I'm wrongly calculating?

Thanks!