Hello @ach1992,
Thank you for contacting the support and we regret the inconvenience caused.
Could you please try using the %pagenumber% variable and see if that helps?
We checked the website and the canonical URLs are also not changing when changing the pages. It seems like the default pagination is not working on the blog page.
Assuming you are using the latest version of all the plugins and the themes (please update if not yet), it would seem like a conflict with one of the plugins or the theme you are using.
To determine that, please follow this troubleshooting guide:
https://rankmath.com/kb/check-plugin-conflicts/
Here is a video you can follow as well: https://www.youtube.com/watch?v=FcIWRhcUP2c
Only the site admin would know and your users won’t be affected by this troubleshooting.
Please let us know how that goes.