The feats are not showing up on our character sheets. We have purchased the DM lvl subscription. When I pull up feats all that shows up is Firearms, grappling and Svirfneblin magic. 

Same here. This has been going on for awhile now

Friend of mine has been trying to convince me it is worth to rebuy all the content I own physically on this site. He has the Master tier subscription and enabled content sharing in his campaign that was created for me to take a look at this service. He has purchased the PHB and several other books.

The feats just do not work with any character I want to create. Even when my friend, the other of content on this site, attempts to modify my character and add feats....even he cannot see anything other than Grapple.

Yeah in our other campaign it works fine but he actually purchased all the books not a subscription. 

Purchasing the books or the individual feats will let you use them on your characters.

If someone has the master tier subscription and enables content sharing, then the content purchased by any anyone in the campaign can be used by the characters in that campaign.

If you have problems with content sharing, turn it off then on again.