SOLVED, PLEASE LOCK 

So, I'm making a refridgerator. id:2932338

It has two pressure chambers which change the temp of the refrigerant. High pressure makes high temp, low pressure means low temp.

The refrigerant, in either liquid or gas form flows through a pipe (I used PPIP) to the other pressure chamber in a loop.

Little HSWC-FILT-FILT-TSMS (or HFFT) and TSNS-FILT-FILT-HSWC (or TFFH) devices pick up the temp of the nearby PPIP carrying the refrigerant and are supposed to make the TTAN sections of the wall that temperature. (I know that to serialize temp you need TSNS with tmp=1, and HSWC with tmp=1. I did that.)

However, the serialization only works on the left side, where the temp is being passed from the pipe on the right to the TTAN on the left, On the other side of the loop, where the device is the other way around, it doesn't work. I suspect this may be a subframe error, since when I flipped the entire fridge around (copy, flip, paste) the sides with the error remained the same.

Pls help.

To recreate, open id:2932338 and add something with a noticeably different temperature, like CFLM or PLSM into the PPIP. Turn on heat view and see the error.

P.S. I play on mobile so my game has limited abilities.

https://powdertoy.co.uk/Browse/View.html?ID=2932338

Edit 1: I removed the surrounding HEAC and TTAN of one on the TFFH devices on the right side, and it works perfectly... but jt doesn't work when surrounded by HEAC and TTAN. Maybe it's picking up the temperature of those elements? Pls help ;-;

Edit 2: Solved; TSNS scans for the last (i.e. rightmost bottommost) particle in its range for serialization. PLS LOCK.