iorbita Indeed quite weird that the relative issue doesnt replicate on local install and Font awesome 4.7.0 icons are reflecting as envisaged. Also, Had made reference to 4.7.0 FA stylesheet for your site to ensure that the same apply
To troubleshoot, You may try the following :
1) Check with other FA icons to see if they are reflecting fine
2) You may check with your hosting provider if they have some server-side caching enabled due to which modifications or changes in respective files might not reflect at times. Due to this, the site might store and reflect old webpages irrespective of changes or modifications being done at times due to same being enabled
