Using Mac Terminal to combine .csv files but running into issue.

[spudn56]

using:
pwd
then
cd /Users/spudn56/Desktop/split100
then
cat *.csv >100-5.csv
It mergers the files, but my .csv files are 1000 rows. when it comes to 1000 row it looks like the example I've attached. These are fictitious names.
How can I fix this?

 

[adel_mahmmoud]

In Column A. Row Containing ‘E’.
Your data have issue I think it doesn’t have newline mark
Try to fix it and it will merge correctly

 

[spudn56]

In Column A. Row Containing ‘E’.
Your data have issue I think it doesn’t have newline mark
Try to fix it and it will merge correctly

Thanks!