Oh. Is the FT when it doesn't touch at all? Sometimes I do that too.
This the that picture from back in 1990 that I mentioned - apologies for the bad hair:Maybe it's moving anchor I am using. I seem to anchor my thumb on the A string, but it's also flat against the E string. Either way, this was not a conscious decision and I spotted by accident with a "WTH is my hand doing" reaction.