Some problem with inserting line in video

Hello everyone,

I'm using insertShape function to show the trajectory of object in video.

Circle markers mean the position of object. I insert lines to connect these circle markers.

However, there's some problem when drawing lines. There are some unexpected line such as the yellow one. I use same position to insert lines and markers.

I have no idea why the yellow line will connect to some other place that doesn't have any markers.

Does anyone know what's wrong with it? Thanks.

[DGM]

This is likely the same problem as this, but it's hard to be sure without being able to replicate the issue with the original data.

https://www.mathworks.com/matlabcentral/answers/411443-problem-with-insertshape