sticky post doesn't appear

2 weeks ago I migrated from .com to .org and now the site is running oke

but I have some questions
1. I have 4 sticky posts and only 3 are shown (theme Linen and site is http://vavia.nl)
2. where can I change the summary of a post (I use several plugins like SEO from Yoast)
3. can I change the button “Read More” on the slider into Dutch “lees meer”