Strymon stereo pedals behaving in an unexpected way

My signal chain is: Compressor -> Mosky Golden Horse -> Tube Screamer -> RAT (all mono) -> Zoom G1X Four then stereo out -> Strymon Brig -> Strymon Cloudburst -> Splitter so one channel goes to Amp A and the other goes to Amp B. Both Strymon pedals are set to Stereo in/Stereo out.

I can only get sound out of Amp B if the Cloudburst is on, and even then it’s only the wet signal with no dry at all, regardless of the Mix setting. Amp A is almost 100% dry but with some of the wet signal.

I get the same thing if I set the Brig to mono in/stereo out.

I’ve read the manual, but this isn’t what I expected to happen, I expected to get a mix of wet and dry to both amps based on the Mix knob.

Is this actually the correct behaviour or am I doing something wrong? All the cables are the correct TRS or TR in the right places.