Invalid second read

[Filip-Konkowski]

When I place a tag it will read twice. The first read is correct, the second is not.
This one is the blue chip
Code: 1016577, Facility: 15, Card: 33537
Code: -1928363263, Facility: -29425, Card: 33537

This one is the card that comes with the rfid module
Code: 15337849, Facility: 234, Card: 2425
Code: -1695938183, Facility: -25878, Card: 2425

RFID module is connected directly to 3.3V/GND and RX (in my case pin 25 on tinyPico).

[mcauser]

Possibly voltage related. I've been running mine at 5V through a level shifter to a 3V3 ESP32.

I remember reading somewhere once that reads are a little inconsistent at < 4V.
If you run it at 5V, you get more reliable reads and a greater range.