On a recent puzzle, I noticed some unexpected mutations
in my structure. I think these might have come from me
pushing the wrong button in the Selection Interface.

https://fold.it/portal/files/foldit_1490200802.png
shows these buttons from left to right:
W (wiggle bb & sc), E (wiggle sc only), T (wiggle bb only), Y (mutate), & S (shake).

I think I must have pressed the Y (mutate) button when
I meant to press one of the W E T S buttons instead.
Such a mistake would be less likely if the order of
the buttons were W E T S Y or Y W E T S instead.
It would be even less likely if the Y button were
further to the right, like between the L and M
buttons.