Region refinments being overwritten by general settings (hex-dominant method)

Hi SimScale Community! I’m having a problem generating specific regions with specific cell sizes (meters) using the Hex-Dominant method to generate a mesh. Describing a bit the problem I have defined the overall mesh size (background mesh box) with a manual size setting of 0.002m and 0.4m, after that I have three additional cartesian boxes where the cell sizes decreases when approaching an object, the sizes are 0.3m, 0.15m and 0.075m. I also have other type of refinments like surface refinment, feature refinment and inflate boundary layer but all of them are being respected.
My main concern and question is should the minimum length cell size of the background mesh box be greater than the 0.3m of the other cartesian boxes?
Thanks everyone for the help in advance!