Artifacts appear dropdown fields at 150%

Steps to Repro:
1. Create a new Project
2. Window > UI > UI elements sample
3. Dock window
4. Scroll down and select choice fields

Actual Result:
Artifacts appear dropdown fields

Expected Result:
No artifacts should be shown the drop down filed

Environment:
Windows and Mac

Occurring with:
2019.3.0a5, 2019.3.0a3

Working with:
2019.3.0a2