Low SI buff disappearing before it runs out

It happens when attacker use their own booster + gets SI also.
No idea why this happens, nor this is fixable, but you can prevent this issue by just not using booster.

since muscle memory is strong, I prefered just removing my own booster on my keyset.
would be temporary way to get out of this problem if you need.

 

Then no idea for your case.

For me same phenomena happened on that situation so i thought yours would same too...

 

I am very sure it's just people not noticing the booster prior to the SI. As someone who bosses a lot with a bucc friend, this never happens to me unless I've boostered before the SI.

Make sure you right click booster BEFORE SI is used.
If in the case, SI is used while booster is active, it will bug out and the SI disappears when the duration of the previous booster ends.

Also, right-clicking SI and re-SI-ing after having SI-ed over the booster will NOT fix the problem. The only solution to this scenario is to either re-equip your weapon and get SI or to wait for it glitch out and then get SI again.

 

You can also booster over your SI, then cancel booster, then re-SI again.