Hi guys, so I've been playing with my halva tornado for awhile but I got an ares partizan recently, so i wanted to sell my halva thanks to a 3 days shop but I can't place it in sale

It's a halva that i bought in player shop for 7m, I didn't craft it or anything, all I did is add abilities (I also noticed that there's a yellow circle next to the picture of the halva). I don't know why I can't resell it since I don't need it anymore

Anyone could help me bcause I'm really confused ? thankks