Wordpress feed not parsed correctly

[utack]

IMPORTANT

Read and tick the following checkbox after you have created the issue or place an x inside the brackets ;)

• I have read the CONTRIBUTING.md and followed the provided tips

Explain the Problem

The feed under https://hk-devblog.com/feed/ does not update or display the newest entries

Steps to Reproduce

1. Add https://hk-devblog.com/feed/ or https://hk-devblog.com/ as source to OC news
2. Look at the articles it fetches, they are outdated
3. Wait for new articles, they are not reported either

System Information

• News app version: 8.8.0
• ownCloud version: 9.1.4
• PHP version: php7.0
• Distribution and version: Ubuntu 16.04