I just tried the Nollie Inward Heelflip and Nollie 360 Inward Heelflip and I definitely see what u're talking about. The Nollie Hardflip and Nollie 360 Hardflip are achievable way more consistently, but the Nollie Inward Heelflip and Nollie 360 Inward Heelflip seem to register my stick movement on the opposite side, but I never went that way.
Instead of registering my stick movement as:
1-12-5 (1 o'clock to 12 o'clock to 5 o'clock)
it registers the movement as:
1-12-7 (1 o'clock to 12 o'clock to 7 o'clock)
or sometimes even as:
2-6 counterclockwise (2 o'clock to 6 o'clock counterclockwise)