Problem with generating posts to RSS FEED

Hello, I have 2 problems with this plugin. I added the plugin on this website groupe-fivalec.com with good parameters, but, it generated only one post on this category : https://www.groupe-fivalec.com/categorie/actualites. It must be generating 50 posts. Other problem, actualization don't work, i must delete all posts and run the rules to actualize posts. Someone can help me please ?