Need Some Help with really weird bug

hmm thanks for both point me, yeah what working after midnight can make with peoples and getting they brains start to melt, lol, but to be fair i could make it without have to add that default value stuff, i had forget to add that node code in the character BP:

this add a value to the anim ref variable, another way to do that which also i did and thinking which one is the best, is creating a interfaceBP and inside that interface create a reference which was weapon on?, then inside animBP create a event to set axe something like that:
errobizarro10.JPG

then in the character BP instead of call the anim ref i call that weapon on.

errobizarro11.JPG

for "performance values what you think would be better approach between those 2?

now after that is go back to my "main current villian called “combo”, lol, i’m still stuck on it, already added sounds and visual effects now the only missing stuff is add the combo and hit/damage detaction to have the character side of combat finished, all others actions mechanics are most finished, now my focus is really the combat.