Could you write a step by step description of how you create those changes and how you add them to the layout?
Like:
1. I place a Change Marker, or I click the Create New Change button in the Change Manager.
2. I draw the Change Marker on the Layout / I drag the Change entry from the Change Manager to the Layout.
etc.
After you add the Change to the Layout, when you go to the Layout Settings Dialog of that Layout, do you see the Change under the latest revision in the Revision History panel of the Dialog?
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac28