In general you will write out pages to swap before evicting them from memory. The goal is never having to wait for a page to finish being flushed to disk to all

In general you will write out pages to swap before evicting them from memory. The goal is never having to wait for a page to finish being flushed to disk to allocate a new page. This means you will sometimes access a page that had been written out to disk but is still available to memory. If you modify it it may be written out again before being read. So it isn't unreasonable to have swap writes be higher than swap reads. However those numbers seem extreme probably some bad tuning or just neglecting to account for the full cost of writing to disk.