Sketchup for web versioning weirdness

I use sketchup for web from several different computers in different locations. I have exactly 1 project, only 1 saved model file. When I open that file on each computer, it shows me the version last edited on that computer, regardless of whether it is the latest revision or not. Even logging into from firefox and simultaneously from chrome using the same credentials on the same computer results in two different versions of the model being shown when I open the file.

How do I cure this so I always get the correct, latest version of the model regardless of where I access it?