Sycraus Tower Bosses - DoTs not working

[Ricdeau]

Anyone else notice this on Amon and Xande?
I throw down my dots and nothing sticks except for Bio II.
My animations for them also appear to stop short.

There's a limit to the amount of DOTs that can be put on a mob. Best thing to do is try to get your DOTs up and not let them drop. Once they drop after the fight is well underway then it's increasingly hard to get them back on. Definitely an issue that SE needs to address.