CSV Import does not import all rows

Hi,

I'm new in this Forum and did not find my issue.

I'm using Talend Open Studio to convert my CSV files I get from the manufacturer to the Store Manager Format and it works fine.
In the file I have 4119 rows, but unfortunately the Store Manager only detects 1589. When I delete the first 1589 rows and save the file, the Store Manager only detects about 1000 rows.
In my Talend Job I enabled to split the Output to more than one file with 1000 rows each. When I want to import, Store Manager only detects 955 rows. After this I have split the files to more files with 750 rows each and Store Manager only detects 706 rows.
In my opinion it makes no sense, because there are the same rows in the file compared to the first one with all products.

Can you please help me with this issue?
I'm using Store Manager 3.7.1 with license Pro (Trial, my customer wants to buy Store Manager Pro after the Shop is built).

Thank you very much and have a nice day

Sebastian Ulbrich