Different Results of blocker issues


I was trying to get the total no.of blocker issues and the type of issues from the SonarCloud on monthly basis but i found a difference in the total blockers.
Total no.of blockers I get from the api
https://sonarcloud.io/api/measures/search_history?component=&metrics=blocker_violations&from=2023-06-01&to=2023-06-30&ps=500 is 0 but i tried with this url its returning some value.


The Measures page is showing the total number of Blocker issues in the project at a given time, while the Issues page is showing issues that were created in that time period.