Got a new problem but may aswell continue with this thread

I will try explain this best i can :/
Main PC - 1st account
PC2 - 4 Slaves

Sometimes when i attack mob/boss in the middle of the fight it seems everything locks up,, all 4 death knights will start moving backwards (not walk, they glide backwards ) This cannot be stopped at all.
Main window (priest comes out of it)

Also sometimes during a fight maybes 1 or 2 death knights wont do anything, click IWT a few more times and they will.
Some spells Dont activate either, will post what i have so far.

Im very new to death knights.
Pretty much flew through 55 to 70 with heirlooms and questing only did 2 BC instances as i was leveling another team via BC only

All 5 currently level 70

Main - Holy Priest
4x Blood Death knights

Key 1 -
/castsequence reset=combat/60 Horn of Winter, Bone Shield, NUL

Key 2 - Spam
#showtooltip
/Assist Focus
/castsequence reset=combat Heart Strike, Death Strike
/cast Rune Strike
/Use 13
/Use 14
using this for now as i figure out what else should be added
Had a much longer one but castsequence macros arnt doing to good on these death knights

Key 3 - still working on another spam setup so currently empty for now

Key 4 -
#showtooltip
/castsequence reset=combat/60 Vampiric Blood, Anti-Magic Shell, Dancing Rune Weapon,NUL

Dancing rune struggles to activate sometimes even though i see full runic power

Key 5 - Rune Tap

Key 6 - #showtootip
/castsequence reset=combat Raise Dead, Icebound Fortitude
/cast Blood Tap

ISboxer Round Robin
#showtooltip
/assist focus
/cast Death Grip
/cast Dark Command

ISboxer Mouse Brodcast for Death and Decay x4

Using Razor Naga Mouse
Num 1 Follow
Num 2 IWT
Num 3 AOE Heals
Num 4+ Targeted Heals

I pretty much always use the mouse for Heals only, so need to get Follow and IWT removed and added somewhere else for easy acces to my fingures to spam.