Thanks for reaching out to the Apple Support Communities, shelovesvintage!
It looks like you're having an issue pinning from Safari to Pinterest. First, I suggest following the steps in this article to Update your iPhone, iPad, or iPod touch and be sure you're running the latest iOS software version.
Next, I recommend checking out this article with steps for How to force an app to close on your iPhone, iPad, or iPod touch and quit the Safari and Pinterest apps. Once it’s closed, Restart your iPhone and test to see if the issues are still going on.
I also suggest checking out this article to Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch and then see if you continue to have issues.
Does this happen with everything you try to pin or with one specific website? Does this happen with certain types of media?
Let me know the results and take care!