This suddenly started to happen for me too. Before i knew when i accidently double tapped, but in last match I missed shroud 3 times in a row! And didn’t notice any double taps. The I thought it was because i did too long tap, but i tested and pressing F1 down continously doesn’t stop shroud. (Wasn’t able to use shroud 5 times total in a match.)
I don’t know if it matters but happened on Forest of Niflhel.