Greetings @mgnrr007

Any reason you cannot use DIMSTYLE command to edit the parameters of that one problematic style to reflect the settings you desired?

And by chance is it using a text STYLE setting that is not what you normally do too? For example, if you only ever use STANDARD as a text style name, it being set in one DWG file to something other than what you expect will result in a text and dimensions looking different.

Then there is the whole "annotative text and dimensions" thing, but you did not mention that as a possibility.