I follow my own Pixelfed account on Mastodon and will often boost posts. I have a pixelfed.social account though. It’s probably a federation issue on your specific Pixelfed instance. I’ve moved the Mastodon account a bunch and I’ve had problems on specific instances. I was never able to see my Pixelfed posts from fedia.social (ice shrimp), for example.
I was also able to search, follow, and see your Pixelfed posts from mastodon.social.
Edit: Your two newest photos from Aug 31st aren’t actually showing up on m.s. and I can’t see them on pixelfed.social either.