Image size on captions (masonry gallery)

Hello,

Please let me know how can I match the font size of the captions on a masonry gallery to be exactly the same as the pages below.
This should be applied to all galleries across the whole website.

The difference is that some pages are using a Flexible Masonry (this one is fine) while others use the Perfect Automatic Masonry (with the font too big). The idea is to match them like the flexible masonry is.

Pages in private for context.

Thank you