Animate is exporting my animation video inverted

It was my first time using Adobe Animate CC and I already finished my animation so I could upload it on YouTube. When exporting, there's no audio but I didn't know you have to set it to Stream from the sound settings and so I did that. I tested the animation and the audio is not syncing with animation, even though it was perfectly synced when the sound was set to Event, I feel like I didn't sync my animation properly with the audio. (Both of the animation and audio are completely normal.)

I was kind of upset and confused after I also exported the mov that time, the animation was inverted (so is the watermark) and I don't really know how to fix this. All I did was to flip my art in separate keyframes horizontally, nothing happened, this final export is different from my stage play. My stage was completely normal. I was very sure I didn't mean to animate half of everything in inverted canvas.

There was also another frame glitching before it even shows up as well. It took me a lot of attempts to try to fix this problem but nothing seemed to be working at all, and it was useless. I've wasted two hours on this yesterday and I was wondering if there's a solution to this...

Was it the properties I messed up? I already knew half of the basics yet sooo I didn't know what was causing this. Anything else? ;-;