Not show content for guests

Hi,
I use:

• [membership]public content[/membership] in the posts to allow guests can see the content.
• [membership level=”1,2,3″]paid content[/membership] to make them to login to continue to see the content.

But the content in [membership]public content[/membership] not show to public, instead of the meaningless words: Lorem ipsum dolor sito amet, conse ctetuer adipiscing elit sed diam nonum nibhie euisod. Facilisis at vero eros et cumsan et iusto odio dignissim qui blandit praesent luptatum zril delenit augue duis dolore te feugait nulla facilisi. Nam liber empori cum solta nobis eleifend option cue nihil imperdiet voluptate velit…

Please tell me what’s wrong with my website? Thank you very much!

I have 3 membership plans with ID are 1, 2, 3.