magento 2.1.8 frontend autocomplete search problem after update from magento 1.9

[InspireDev]

Client has given me Magento 2.1.8 files and migrated database after done upgradation from magento 1.9. I have changed the design only, by setting up into my server. Now the problem is when i search by the word 'Rotabroach' in frontend search bar, some search result is showing and when i click on the search result it directly send me to there live site but if i search by some other word it's linked to my site. I have clean and flush the cache and also reindex it. But still the problem not solved. Can anyone please help me to find out the problem?
Thanking you.

[InspireDev · Accepted solution]

I have found the reason for this issue.
In admin panel under Marketing click on search Terms and found there some search key set redirect url. I have just change the urls and the problem solved.