http://www.ajc.com/sports/college/multiple-schedule-shifts-for-georgia-tech/VJwqJep5WuBPn61bmTFuCO/
Relevant parts from the article in 2016:
"Lastly, Tulane has canceled its 2018 game with Tech at Bobby Dodd Stadium. Tulane is contractually obligated to pay Tech $300,000 for the cancellation. That leaves one game remaining in the four-game series begun in 2014, a 2019 game in New Orleans. Tech is considering canceling that game.
Tech senior associate athletic director John David Wicker said that he is close to scheduling guarantee games, likely against FCS opponents, for 2018 and 2019.
The changes were made for multiple reasons. Tulane bought out the 2018 game because it was offered a game against Ohio State that year. That change prompted Wicker to look to South Florida to move the series, a switch that proved beneficial for USF, also. The Notre Dame game was moved at the request of ACC and Notre Dame, and the Bowling Green State game was also involved in that switch.