Did this issue happen before you installed the plug-in? Or just after?
I’d start by doubling checking the value of your A Record. Depending on where your DNS lives, it can take a few days to reflect the update.
If you’ve already done that, and it looks correct, I’d check if it’s a caching issue. Clear browser caches, any plug-in and hosting caches, and local caches.
Did this issue happen before you installed the plug-in? Or just after?
I’d start by doubling checking the value of your A Record. Depending on where your DNS lives, it can take a few days to reflect the update.
If you’ve already done that, and it looks correct, I’d check if it’s a caching issue. Clear browser caches, any plug-in and hosting caches, and local caches.