Question signal bars always showing full

I have this problem with the signal bars, always show as full, even if the sugnal is not, I have a xposed module thst shows signal level always less than 70%, but the bars dont change, somebody knows a cause for this?
former symbian user, N95, N97, N8

old devices xperia S Lt 26, SGS 3 GT i9300 Saphire black,

current galaxy note 3 sm 900w8 black, debloated stock, rooted, . xposed framework, knox state 0x1