Home page redirect after changing A record

Hi,

my website was running on godaddy hosting.
I have built a new website in ipage.
So I have changed “A” record in godaddy to point the website to new version at ipage. It is successful.

However there is a problem with URL redirect.
Before changing “A” record, site URL “kietgroup.com” redirected to “kietgroup.com/index_main.php”

After changing “A” record also, it still points to “kietgroup.com/index_main.php” and giving 404 error. I do not want URL redirect.

Old site is php
New site is wordpress

Kindly help. Spent half day but couldn’t figure out anything