Just FYI, upgraded WordPress to version 4.5 and sp-faq to latest version 3.2.3, and this problem happened again. This is the second time I encountered the problem after the first time happened when I upgraded sp-faq from version 3.1.1 to version 3.2.1.
The solution is to recreate the FAQ categories, re-categorize all FAQ pages and modify the FAQ page with the new FAQ category shortcode numbers. Those who has many FAQ pages might find this very tedious.
Hoping to have permanent solution so that this problem will not happen again every time we do upgrade.
Thank you. 🙂
