@jenwhitedesign . Thank you for your answer but the issue is that I have an auto update in Wordfence. When Wordfence updates automatically the testimonial pages displays 404 until I logged and disable/enable the Testimonial Rotator plugin to fix the 404 pages.
I want to know why it happens so I can fix this issue so I don’t have to worry that my testimonial pages will display 404 every Wordfence update.