Mismatch between O2 mobile prices on MSE comparison site, and O2 website

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On MSE's cheap mobile finder website ([MSE url]/cheap-mobile-finder/sim-only/#newcustomersonly -- sorry not allowed to post links) the prices (for O2) are shown much lower than they actually are. When I click on "Get deal" I get to the O2 website with ~2x higher prices.

Does this happen to anyone else? Below are screenshots of the two sites:

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