Incoming heals on raid frames problem

[atnrax]

Is that only me, or it's bugged, but I can't see only incoming heals from HOTs on my raid frames. I turn everything on, but nothing happen. I am using VuhDo for raid frames.... and I can't see eaven there. So, I try with VuhDo and Blizz default raid frames, but same happen. So, anyone have solution for this? For me, it's really important to know how big is your heal gonna be, so I can decide, should I focus more on that target, or I can switch to someone else... I see remaining shields too, but I can't see heals.