Why my Insta360 record slow motion by default ?

Hello everyone, I hope you guys have a good day. I have this insta360 One RS for few months but never really use it before and I just recently use it again for my travelling video. But I dont know why all my videos recorded in slow motion in default. So, when I open the video file in insta360 app to edit them I found that all my videos are slow motion when I check and re-check I set them in 'standard' video setting. All of my videos has 'turtle/tortoise' logo on it. And also the audio is muted when I play them (in slow motion) unless when I set speed to 16x. Audio are also sounds very bad, the sounds are like cut and stop every second. Please someone help me.