HTMHell | bad practices in HTML | Web Site library

I am dealing with kind of an odd problem here. I have a for loop that goes through an array composed of various text lines previously input by the user with the following preset:

Name

Data1 of Name1

Data2 of Name1 (This goes on for DataN of NameX as Data is a series of properties that the user chooses [i.e: 11 columns requires up to Name + Data10])

Anyway, everything goes smoothly until, at least on my test dataset, around loop 400, where the array output shows me

Name

Whitespace

Data1 of Name

Whitespace

Data2 of Name

When I test the problematic user inputs, deleting every one before them, and just pasting them as the sole inputs, ie: Copying Name and Data 400 and 401 and just pasting as Name and Data 0 and 1, no issue found, although around 100 cycles later, the Name100 Data1 following seem to suffer the same problem.

TL;DR - PHP Seems to be injecting whitespace positions on my array after N loops and it seems to happen randomly but steadily after a few hundred loops. Can anyone enlighten me? Many thanks.

P.S - I have double checked the dataset and there are no whitespaces where they're showing up.

I am adding data to a table using ajax. In the onclick attribute of button I am calling a function which contains id, name, as first two parameters where as the third parameter is a function call which returns array.

Now the problem is that first two parameters are passed successfully to javascript function but third parameter which is array is not passing to javascript function.

How can I pass php array as a parameter to javascript function which can be accessed in javascript function like array[0], array1 based on number of values in it. Please Help.

PHP file: