SPDT relay is not switching
These are 48V coil relays. 

You can drive the LED with 3~5V but the coil needs 48V on Vcc and Gnd.

Maybe you bought the wrong relays.

(not exactly as later found on website)







simulate this circuit &ndash; Schematic created using CircuitLab
Above was my guess.

below is from website

8ch 48V coil boards

53831



Looks like I guessed wrong on the LED connection from your photo, but close enough on the driver level. Your link was for a different board. (24V)

So Vcc is 48V with common ground with driver = 3.3V to 5V

So yes it looks like your connections were incorrect, perhaps ground or one port transistor is damaged with significantly reduced hFE if the logic input threshold is now 29V instead of &lt;3V