Devlin was first scored by referee John Beyton in the 76th minute of the referee John Beyton in Pope Gio, with Harts coach Neil Kerishli who disagreed with the decision after the Aberdin striker was out of the pitch.
Then the 26-year-old midfielder, the second yellow, said Davlin had not seen Dante Paulvara arrive there when he tried to clean the penalty box only.
“It’s the club’s opinion that no yellow cards out of the game as Davlin were not guaranteed and it shouldn’t have been put into a finishing position with nine men, which directly affected the result,” Harts said.
“Saturday came on the back of other decisions this season that they haven’t gone in our favor.
“Once again, we will contact Scotland’s FA in an attempt to understand why these decisions are made. Look when they are really wrong and we will determine what is being done to learn them to make sure they have not been repeated.
Hearts say they have “democratic dialogue” with the board of directors throughout the season and “they prefer to spread our protests in particular.
But on this occasion, “obsider the size of the event and what was in danger,” they believed that they should explain to their supporters that “public silence on our part should not be wrongly considered in practice.
“About 22,000 sticks in Hampden Park have been incredible and your support has undoubtedly inspiring the team on the pitch to fight until the end, in the face of all possibilities.
Harts, who is seventh in the Scottish Premier League, must now avoid the decline in five games in their last six games.
“Recently, the club have openly said that this season has not been good and we mean not to see it again,” they said.