Created attachment 125000 [details]
The problematic document
Attached docx file has two horizontal lines in it, both aligned center.
First one is rendered aligned to the left and the second renders correctly centered.
Created attachment 125001 [details]
Document rendered in MSO 2010
Created attachment 125002 [details]
Document rendered in Writer 5.1.3
Arch Linux 64-bit, KDE Plasma 5
Build ID: 1dbdc947fcc9d843764731e6dae7ce60082576e0
CPU Threads: 8; OS Version: Linux 4.5; UI Render: default;
Locale: fi-FI (fi_FI.UTF-8)
Built on May 14th 2016
Looks fine at least with 5.3.7.
Gabor, please folow your bugs.