BPC 10 changes dim members in report by itself?

Hi,

we're using BPC 10, version for MS, SP18.

When developing templates, I sometimes stumble upon the error, that I first create a report with, say, base level of a certain dimension in the rows. After some steps in developing the template, the rows are either turned into static values in the report editor, or the report editor changed my initial instruction to Context.

I don't really know when or why this happens (can't really reproduce it seriously, it just 'happens sometimes'). Has anybody else seen this behaviour?

Thanks, Philipp