Total number of clicks changes for different dimensions in Google Search Console

Question

I am trying to retrieve information form Google Search Console using Python API (v3). I am experiencing strange behavior (not only through API but also in the web). The total amount of clicks when no dimension is specified is: 99133.0 . When I specify dimension page the total number of clicks is larger: 100718.0 . When I specify page and query in dimension, I get: 40191.0 as the total number of clicks. I have no idea where do these differences come from. I though that the summarized number of clicks should be the same. Any ideas?