Section title with not working

I am setting a with of 50% on the section title element, and it is being reflected on the site. Before the latest updates of the theme, this was working perfectly. Could you please advise regarding what to do to fix it?
Cheers

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Hello,

We just tested this on your website and this option works correctly for the first section title on your page. Please, check this short video https://gyazo.com/d393e8f75cf7933562ef9e58ffac47f2

Kind Regards

[Author]

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