I am having an issue with directory

Hi,

I have a page as “xxx.com/content/offer”.
In my home page, I have a html code as <a href="offer">Sell your house </a>.

When I visit the home page and click the link “Sell your house”, I get the page xxx.com/content/offer.
When I visit the home page using mobile phone and click the link “Sell your house”, it says page not found.

I am not sure why mobile page would give the error.

Please advise.

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/22/feed