Audio out of sync after export

[Wanderer]

Hi there.
After Export, the audio’s out of sync with my lip movements.
Is this because I change Resolution to 1920 and 1080 before I export?
If I’m not supposed to do that, then how do I export in HD?

I make videos on YouTube.

Thanks in advance.

[shotcut]

Video Mode

Introduction Video Mode is the project resolution, aspect ratio, frame rate, and color space. It is important to set this as you desire at the beginning of your project. If you try to change it later Shotcut will try to retain the timing of edits, but some users have reported problems, and it is risky. Also, at this time Shotcut will not automatically adjust anything for you related to size and positioning of elements like text and picture-in-picture when changing resolution. You can think of…

[awake]

Other factors that can affect synchronization are the type of video and audio encoding - variable frame rates in particular can be problematic.