featured image problem

Please read here for more: https://www.mashshare.net/faq/#Facebook_is_showing_wrong_image_or_share_text

but how times should i keep on doing that ?

You have to use an open graph plugin to be able to provide the share image as an og_image tag within your websites source. You can use the Mashshare free open graph add-on or any other one. Open than the facebook debugger https://developers.facebook.com/tools/debug/. Click on “fetch new scrape information” and you are done