Steps to Reproduce:
1. Sign in and place a Wiki portlet on the page
2. Create 5 wiki pages
3. Click the Wiki portlet > All Pages
4. Click the paginator dropdown "Page 1 of 1"
The box listing the pages opens top right and is centered. (Documents and Media paginator behavior)
The box appears on the bottom left and is offset.
Reproduced in 7.1.x-private: 3e02e3108817dd91f4873dca09c0791892e4d27c
Reproduced in master: b0b10bb83dd164f4ff3cd71fe3d08b04af18296e