Question about market share

[SirTurtleton]

Hello all, I recently purchased Capitalism 2 on Steam and have been enjoying the game so far. I'm playing on the second scenario and the market share is a bit puzzling to me. I searched for the definition and example of the term yet I can't figure out how it is calculated in game. Here are the screenshots I took from the current game.

I want to focus on ice cream dominance so the leader has 61% share on the market. Then I go ahead to check my said product summary.

And the product details of the two companies


But I don't understand how the other company (blue) can lead me by around 30% in market share. According to the pie chart in product summary page, it seems like we have the same percentage of share. Is this a bug or am I missing something?

[Speltor]

First screen is about all cities, second one about Geneve and last one about Cincinnatti