Investigate the CSS code for the 'info' alert type, likely in sweetalert.css or similar. The issue is that the dot in the 'i' character is not centered in IE11. Look at the icon rendering CSS, possibly using a pseudo element or background image. Check for any IE specific hacks or missing centering properties. Review comments in the issue for any additional details on the expected behavior.
Dot in "i" in alert type info is not in center in IE11 · t4t5/sweetalert#611 | Good First Issue