Hey Hal!
If it's only 1% it is most likely these are honest mistakes.
Even before HRT I had the times people thought I am a girl

Old people are more likely to confuse, my grandma many times refers even mom's boyfriend as a she and there is no doubt in him.
Adult people sometimes might just confuse for who knows why and sometimes children but that's usually rare.
As for him seeming not sure and changing to "they", after about 8 months on T, as far as I know, you still have a way to go.
It might not be valid for you, but some of the guys I know that are on T for about a year, still have some feminine shape because of their fat.
Some of them have still a lot of fat in their hips and a bit of feminine markers on the face.
Usually, they pass most of the time but still have problems.
Another guys I met been on t for about 2 years or more, they just pass.. 100%.
Some seem to have full facial hair growing (although shaved), no more fat at the hips so they look fine.
The worse you could think about some of them is that they look like kind of young men/boys but not a girl, not a chance.
So try to find what it is