SIM800L prints strange characters ot HTTPPARA="URL"

I'm trying to post on a web server some datas, using the AT commands, by typing them directly on the serial monitor, it just works perfectly, giving 0,200,35 as response.

If I try instead to send them directly from my Arduino sketch (exactly the same procedure), what happen is that some really strange characters appears, and the response usually is 0,200,365 (which seem to be ok, but actually it's not).

The url seems to get truncating or idk, does anybody exeperience that?

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