problem with colors

problem with colors

hi to all!
when i use the emulator i've got the correct colors in the section content with a data-theme. however when i run in a tabblet i have diferents colors say for exemple a blue color as backgound and a white color with text. what can i do? i've used the theme-roller also and created a new data-theme but also with no result! is it possible thar each tabblet or at least a group of tabblets have diferent ways to show the same code of colors?