No data only exclamation mark

I have canadian rogers lg g3.i have flashed cm and aosp as well as other like miui.I have never had an issue conecting to data services but now whenever i flash anything other than custom STOCK roms i get signal bars but no 4g logo and a strange exclamation mark.help me figure what i have done.and i also am able to send and receive texts.i have checked and apn is correct.never had an issue before so i know I have done it

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