Some twitter experts among us?

Hi,
Customer has a post that is modified/rewritten each week.
Then they tweet it over en over again (each week after updating text)

this is the post url http://stjandedoper-vechtenvenen.nl/verrijzenisgemeenschap/mededelingen/
They have tweeted it today (https://twitter.com/search?f=tweets&q=%23rkverrijzenisgemeenschap&src=typd), but the excerpt by twitter is the old post, before updating it today.
The post url brings me to the new updated text. But, tweet brings me the excerpt from before update.

How can I get that tweet mirror the updated post/text.

Cheers