Sounds like you have already done a fair bit of trouble shooting.
I suspect that might be a bug in Warzone itself with the recently added a system that tries to remove nodes from maps to reduce their size.
Things to double check before making a bug report:
1. Each shape of your text is a path (not an stroke, rectangle, etc): Menu > Path > Object To Path
2. Your transformations should be applied on a pixel level (each node should have its x/y position on its final location, WZ tends to ignore any transforms added to full shapes)
3. Your units are in pixels, of both the nodes on the map and the document properties itself
If there are any issues with paths appearing weirdly on WZ, its usually one of the things above.
Also, consider joining the Map Makers discord:
https://discord.gg/pbqT8NUw