My android updated and now my messaging bubble text is white on white.Why

My text is now white on white in the bubble

My messaging bubble text is now white on white

What update, phone and texting app?

The latest android update and my messaging app

My phone galaxy 8

"my messaging app" can be any of at least a dozen messaging apps - do you mean the one that came with the phone? If so, look in the app's settings for a setting to change the bubble or background colors.