One day while browsing on the websites we are maintaining, I saw that FB Page Plugin only shows half. So there must be something that is causing it. In my investigation, it turns out that Simple Share Buttons Adder is the culprit.
So here’s how to implement a simple fix:
1. Go to the Settings>>Simple Share Buttons.
2. Then go to CSS tab >> Additional
3. Add the code:
.fb_iframe_widget span { width: 300px !important; };
4. Click the Save icon