Javascript embedded data causing strange exported file

Edit: turns out the problem was with Excel. Reading the file into a statistical program worked fine.

I have set up some code in my survey, including setting some embedded data. But when I export the data into a CSV file, there are some rows that just have numbers in each column rather than the regular data such as start date, response type, etc. I am just getting started with Javascript and most of the code I got from elsewhere, including answers to questions here, and I'm having trouble figuring out where the problem is.

I have a lot of code that is all set to one question and I attached all of it as a png. But here are the lines that set embedded data:

Qualtrics.SurveyEngine.addOnPageSubmit(function(type)
{
if(type == "next")
{
Qualtrics.SurveyEngine.setEmbeddedData("xPos", delayedXPos.join());
Qualtrics.SurveyEngine.setEmbeddedData("yPos", delayedYPos.join());
Qualtrics.SurveyEngine.setEmbeddedData("time", delayedTime.join());
Qualtrics.SurveyEngine.setEmbeddedData("rectDims", rectDims);
}
});

xPos is a list of x coordinates of the mouse, yPos is a list of y coordinates of the mouse, time is a list of seconds, and rectDims is an array with four coordinates of an image that is added to the survey using HTML.

Any suggestions for figuring out the problem? Thanks!