Why do my multiple Print String lines stack on top of each other?

Same Key overrides slot. Default -1 means slot 0. Pass unique integer Keys per print: 1, 2, 3 for separate slots.

AddOnScreenDebugMessage in C++?

GEngine->AddOnScreenDebugMessage(Key, Duration, Color, Text). Same Key replaces existing message; unique Key adds new line.

Higher Keys appear higher on screen. Reserve specific Keys for status types (HP=10, Ammo=11, FPS=12).

Fix: Unreal Print String Lines Overlap

Quick answer: Pass unique integer Key per Print String. Default -1 stacks on slot 0.

Print String for HP and Ammo. Both show on the same line. Same default Key overrides.

The Fix

BP:
  Print String("HP: 80", Key=10, Duration=2.0)
  Print String("Ammo: 30", Key=11, Duration=2.0)

// C++ direct
GEngine->AddOnScreenDebugMessage(10, 2, FColor::Green, TEXT("HP: 80"));
GEngine->AddOnScreenDebugMessage(11, 2, FColor::Yellow, TEXT("Ammo: 30"));

Each Key gets its own slot. Same key updates the existing slot in place — useful for live HUD displays.

Verifying

Both lines visible separately. Stable per-frame replacement when keys reused.

“Unique keys. Slots distinct.”

Related Issues

For Print String shipping, see shipping. For Tick after pause, see tick pause.

Keys distinct. Lines split.