[Plugin: postTabs] How to have more groups of tabs

I’m trying to have more tabs’ groups in my page, but things don’t work.
If I write:

“content”
[tab:1]
“content”
[tab:2]
“content”
[tab:END]
“content”

everything is fine. But if I try to add more tabs later in the page everything goes nuts: the tabs regroups, content doesn,t show up in tabs, etc.

So, what I’d want is:

“content”
[tab:1]
“content”
[tab:2]
“content”
[tab:END]
“more content”
[tab:3]
“content”
[tab:4]
“content”
[tab:END]

Is it possible?