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Hello @mastaliyev,
Thank you for contacting support.
You are using a value of 1 for the “max-snippet” option in the robots meta settings for the page. That indicates to Google that it should use a maximum of 1 character in the snippet (description) generation.
Please set those values to the default which is -1 and it means unlimited so Google will generate the description according to their limitation on the number of characters.
Here’s a screenshot for reference on how this should look like in the backend: https://i.rankmath.com/i/7HANf1
Hope this helps solve your issues.
Don’t hesitate to get in touch if you have any other questions.