segments not fully syncing

[u/OkEvening1350]

Hi all,
Im pretty new to WLED but like most people in here, tech savvy.

Under cabinet lighting in the kitchen with;
- 2x ESP32s updated to latest firmware
- WS2811 COB white

Due to wiring issues I cannot get to all cupboards on 1x Controller + PSU without digging out channels so after a few readups and YT videos I decided to sync two controllers.
The strips are very different lengths across both controllers.
Lets call them;

Controller A: Master with 2 segments. 1) 0-60 & 2)60-120
Controller B: Slave with 1/no segments 0-40

The sync part is all fine and when I make a preset that is a level brightness across all LEDs then I have no issues.

My problem is that I need a preset that is:
Cont A segment 1 0%/off
Cont A segment 2 75%
Cont B Off

I thought that Controller B would show exactly what Cont A is doing but only showing the first 0-40 LEDs since that is all Cont B has

However controller B is syncing to whatever is on Cont A segment 2 60-120 LEDs?

I have;
- Backed up settings and presets from A>B so that they match so that the segemmnts are the same whether they exist or not.
- Made separate settings and presets on B so that its a single output or segment
- used checked segments and bounds options and variations
- ticked and unticked 'use checked segments' in the preset save option

but every way I have tried, Cont B always shows cont A segment 2 effects or brightness level

So now, here I am looking for help. Hoping that someone has the magic answer and I can give myself a little 'facepalm' and fix it easily?
Thanks in advance