u/Shoddy-Willingness93

Can anyone explain this to me, i've looked for ages for an answer. When you charge the sword it gives you mindseye and allows you to keep fighting when the sword is overcharge rather than bouncing off the monster. But when the sword is overcharged, hitting a part of the monster where the damage numbers are usually yellow to indicate you're hitting a weak point, it changes to white and the sound effect changes. Does this mean I'm now not doing weak point damage? Why does it change to white? Its driving me mad.