rifkinurfaiz on Only can upload a value to thingspeak from arduino

Recently, i just started to use thingspeak (link: https://thingspeak.com/channels/232957). I'm using Arduino and esp8266 for internet connection. I'm using serial monitor to upload a value. I found an odd issue like this:

AT+CIPSTART="TCP","184.106.153.149",80
AT+CIPSEND=48
GET /update?api_key=AYPJYH6PHJ0LIEL7&field1=30

Here are the responds:

AT+CIPSTART="TCP","184.106.153.149",80
CONNECT
OK

AT+CIPSEND=48
OK
> 

Recv 48 bytes
SEND OK
+IPD,2:15CLOSED

For value 30 it's uploaded successfully to thingspeak. But whenever i change the value, like become 35 or another 2 digit value, it always responds bad request. But when i try at browser any value works.

Anybody experienced same thing?

nb: on my channel, value 36 is uploaded via browser