Node.js serialport readline parser - response devided to each sign in new line

Question

I would need some help in resolving a node.js problem with serialport response on one computer with Ubuntu 18.04 64-bit.
On the beginning I can confirm that the hardware which I have connected answers correctly in for example minicom. On an ARM computer the readline serialport response works very good, every answer from serial port is everytime readable, but on the Ubuntu 18.04 machine, when I send for example

AT+CGPSPWR=1\n

the answer looks like this:

A
T
+
C
G
S
P
W
R
=
1

O
K

I have this issue only on one machine, but the most important for me. I tried to change the parser from readline to raw - got the same answer. Also installed another serialport version and still no luck.

I really have no idea how to resolve this issue.
The answer from serial port I've got via main serialport function (which works everywhere else for checking serial:

serialPort.on("data", function (data) {
    console.log(data.toString());
});

And this is the response:

Node 10.12.0
"gps": "^0.4.8",
"parsers": "^0.1.1",
"readline": "^1.3.0",
"serialport": "^7.1.3"