Font size can’t be changed

For the last 2 weeks I haven’t been able to change the font size in Typography, using Gutenberg block.
I add a paragraph, write my phrase, select and go to typography to change the font size to large, but as soon as I select it, it goes back to default. It never changes.

I’m using the updated version of WordPress 5.6.1
I use the Feast Plugin for my Theme (Brunch Pro)

Can you help me with this??
Thank you so much!

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