From time to time, Facebook blocks links for "violation of community standards" even when that's not actually the case. If this happens to you, just use the link to report the photo as not spam (TODO: add a screenshot). Facebook should restore your photos relatively quickly, especially if you report a large number of them as "not spam".
You can also report the error to Facebook by using their Sharing Debugger tool. Just paste one of your claim links in the URL field and click "Debug". If you see an error message stating that "We can't review this website because the content...", just click the "let us know" link and submit feedback indicating that the link is not spam.