Any other PLDS noticing this?

[Pnyapa]

So far my Shelltron would occasionally not pop on Twin Bolt from O1S or Earth Shaker from O4S. I can't tell if I'm doing it too soon or too late. I would watch the Shelltron buff icon activated throughout the cast, but it would not proc EVEN THOUGH it was still on me after the move went off, a good 3-5 seconds of duration would still be there.