Data Colors Change in Service vs Desktop (different color priorities)

When setting up a report in PowerBI Desktop, colours are set on graphs for bars or lines. They could default to the PowerBI colour scheme - or imported colour theme (and then defaulting to the order that PowerBI allocates) - or could be sepcifically selected (eg. with multiple graphs on same page - it is common best practice to use consistency and have the same colour represent the same thing on each graph - eg. the same region on separate graphs be the same colour - or the same productline on separate graphs be the same colour).  The problem is that what colours that are set up and what we can see in PowerBI desktop - isn't always what is seen when the report is published. It's quite random. Sometimes it stays consistent - sometimes it doesn't. It might be that the order of the colours in the desktop are -red, blue, green, yellow - and then when it's published it is yellow, green, blue, red. So any work trying to follow best practice and consistency - can be wasted.  The expectation is that whatever we see in PowerBI desktop - should carry through to when it is published.