Originally Posted by
FuncK_D
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You need to be aware of your pressing back movement on habit or accident with your left thumb.
I used to do this all the time and I'm pretty sure it was just a consequence of playing Highlander so much and having to backwards attack so frequently to get into quick OF. So on other characters I think my thumb might have been slightly and unintentionally twitching backwards on any given attack, hence starting to register as backwalking and causing a whiff attack.
Just be more aware of that and it'll go away with practice.