Fix wordpress ajax download bug

There is a site with complex functionality (aggregator) on wordpress: https:// Jurist.rf
There are several unpleasant bugs that need to be fixed:
1) When you select something in the filter on the page with the list of companies (https://xn--b1ajca8aecgj8gya.xn--p1ai/rating/), the content is repeatedly loaded.
2) When you open the next page on the same page, the same companies are loaded.

It is necessary to understand and fix the bugs. In the process of fixing, additional tasks may appear (for example, if other bugs come out), you need to be prepared for this.

Please indicate in the answer to the order:
- a comfortable hourly rate at which you are ready to work on tasks,
- do you have experience working on projects of similar complexity,
- where you can ask additional questions about qualifications and answer questions about the task.

Please do not respond to a project if you are a manager, are not ready to work on a rate or you do not have experience with OOP.