The idea of showing “…” in pagination is to keep everything summarized within a line. However, this system doesn’t work good in your theme. Please check the attachment.

When you’re in the first pages, the “…” shows well in the center and the pagination remains displayed on only one line like this : 1 – 2 … – 9 – 10

When you’re in the middle pages, the “…” simply disappears but that’s not fine. What should happen is this 1 … 5 – 6 – 7 … 10

The dots should be adjusted depending where you are in the pagination.