While I was working on a Clue Scroll (hard) task, I became a victim of a glitch, the following will summarize what happened.
For this Clue Scroll I had to equip the Tokhaar-Kal cape for anything to count towards the tasks. I put the cape on also had the Clue Scroll in my inventory. The first task was to kill 224 Ankous in the wilderness, the 2nd was to high alch 4 Amulets of the damned, which I did while equipping the cape and having the clue scroll in my inventory. After High alching them which was the task I wanted to do first, nothing appeared updated on my clue scroll. Refreshed, logged out logged back in and it still showed it was white, not green as if it was finished. Yes I made sure to use High Alch on all 4 amulets, it did not work and I ended up high alching all 4 for no reason. I did submit this issue to staff.