WSPXL103 - 2nd string not working properly

Hi,
Recently bought a WSPXL103 (Reindeer) soldering and programming kit for my kids.
Soldering all done (was some fun!), but I can’t get the 2nd string properly working.

Also looked into the schematics, but can’t get it figured out…

So the 1st string is properly working.
But then after the last LED from the first string, the schematics come at the pin header.


I have 3 pins:
RHS = end of string 1
MID = beginning of string 2
LHS = Rear end of the resistor that is coming from the arduino

So I put the jumper from RHS to MID pin (the jumper does not fit at all, so now even just soldered it toghether).

I have the 1st LED from the 2nd string working properly.
The 2nd LED is lighting RED (while others are white), so I believe that the current it’s receiving is too low.
From 3th LED onwards, the 2nd string isn’t lighting anymore…

What am I doing wrong?
Any help would be appreciated.

Test for continuity with a multimeter. Even if your soldering appears solid, prolonged heat may have damaged the pads beneath the solder.

Thx for your answer. Already fully measured: 5V, gnd, singal.

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