Headlights wont dim or turn off

[nrb's70gmc]

Yes, another headlight question -

quick run down
(i have the HD headlight harness from LMC with newer relays, not chinese ones that came with harness, upgraded headlight housings with removable h4 bulbs. have changed dimmer switch within past year

so im at my friends house go to leave
start truck turn on lights

nothing but running lights and blue halos (powed from side markers wiring)
realized high beams were (supposed to be on)

hit the dimmer low beams pop on
hit dimmer lights go out (great high beams dont work)

drive home turn off lights (everything off except headlights)

pull headlights back on

hit dimmer high beams pop on (great working again)
hit dimmer (now wont dim to low beam)

turn headlights off (high beams stay on) with headlight switch off

all other lights function as they should

disconnected battery (lights off) and came in now typing this