I think it's caused by the wrap size doesn't change when the UMG Design Window zooms.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-224332 in the post.
| 0 | 
| Component | UE - Editor - UI Systems - Slate | 
|---|---|
| Affects Versions | 5.4.4 | 
| Created | Sep 14, 2024 | 
|---|---|
| Resolved | Sep 19, 2024 | 
| Updated | Jan 11, 2025 |