Hi
Text seems centered here.:wacko:
When you say you are "manually" centering the text; are you doing this with the Position effect ? Normally the text box controls will place the text centrally and adding an effect is not required........

A very low resolution quality export mp4 shows the text central............ (screengrab from vlc player)

Exported at High Quality the same clip shows the text still centrally placed...

This is using VP 8.10. Check the text box settings and any effects you may have added.
Nat