I am seeing this in GrampsAIO-5.2.0-r1-60a43c7_win64
In addition to the Birth error…
Baptism events are using the Engaged symbol.
Marriage events use the Divorce symbol.
Divorced events are using the Partner symbol.
These are in the Relationships, Pedigree, H Tree, Timeline Pedigree views
I unchecked the Use Symbols in Preferences and in the replacements options, I typed in the name of the Events. It clearly displayed what was going on.
EDIT: Resolved
GitHub Pull Request 1508 and MantisBT Bug Report 12965