Issue

This is my first ever refinishing project. I failed to take a before picture 🤦🏽‍♀️ but it was a very orange color before. I have been sanding down starting at 80 grit working my way to 120. I have also done a bleach wash. I started noticing this on some of the pieces. Does anyone know what may be causing this? Ps yes I know there is a drip that’s from a failed paint wash attempt.

This is my first ever refinishing project. I failed to take a before picture 🤦🏽‍♀️ but it was a very orange color before. I have been sanding down starting at 80 grit working my way to 120. I have also done a bleach wash. I started noticing this on some of the pieces. Does anyone know what may be causing this? Ps yes I know there is a drip that’s from a failed paint wash attempt.