Then the only thing I can think of is that you don’t have the 0.37 update. As that is the update for the Tank variant scene. The best way to tell is to see what is shown on the title screen. Should be big and bold but in case you don’t see it, 0.36 should have Logan on the main title screen while 0.37 should have Caleb.
Well good news, in 0.38 you can now set Tank behavior by giving him potions so hopefully that may fix your issue and you get the see the various scenes for Tank. You need Dominant and/or Submissive potions along with a Top or Bottom potion, with that you can change his position when you talk with him. All combinations are available minus the Dominant Bottom, that hasn't been written yet.