Why are SPWRA and SPWRB trading at different prices?

Both are stocks in the exact same company and I believe are identical other than SPWRB has 8 voting rights per share and SPWRA has just one voting right per share. Presumably SPWRB, because of it's additional voting rights, would be worth slightly more - but, SPWRA is trading $8-$10 per share higher than... show more Both are stocks in the exact same company and I believe are identical other than SPWRB has 8 voting rights per share and SPWRA has just one voting right per share. Presumably SPWRB, because of it's additional voting rights, would be worth slightly more - but, SPWRA is trading $8-$10 per share higher than SPWRB. What is causing this to happen?
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