Stuck in perpetual peaceful mode no matter the difficulty setting

Tablet RCA voyager, and an HP tablet I don't have the full info on. Whatever setting I put the difficulty on, no minsters will spawn at all, mobs spawn as usual. I am stuck in peaceful mode. My hearts replenish by themselves and everything. I have Uninstaller and reinstalled from Google play store as well as from system in my tablet to fully clear it out. Still nothing.
**Also tested it on my Samsung Galaxy s5 and the same results.
Am I missing something?