Why does my TextRenderActor look bad when it moves?

Sorry for coming back late. Here it is, the image is from my character blueprint’s Tick (one of the Tick’s sequence parts, actually).

And I don’t know if the text becoming partly translucent is the best way to describe this; actually it seems that with movement of the character, the text render actor relative to its location sees how some part of the text lettes loose part of thickness; it looks bad.

[dxdiag_relevant_part][2]