Twitter share button opens two tabs on Safari

I'm using the following URL to share the page on Twitter:

https://twitter.com/intent/tweet?text=POST_TITLE&POST_URL&via=akhbar

It works fine with all browsers and mobile devices, except Safari, it opens:

• One tab with the previous URL, but adds the following parameter to the end of the URL: &original_referer=POST_URL
• A new window (that shows the Tweet composer) with the original share button's URL.

Why does this happen on Safari? And how to avoid this?

I've solved this by changing the Twitter share URL to this:

https://twitter.com/share?url=POST_URL&via=akhbar&text=POST_TITLE

But I've no idea what are the differences between intent and share, and why that was happening with the old URL.