Mystery blinker issue

[XLexusTech]

67 Camaro with 69 valance and LED park/marker billett lights
Idid it column with converter connector to go form horseshoe style to flat..

factory headlight switch.
all new painless fuze box and harness.
Electronic flasher with ground.
1157 tail light bulbs.
Problem
when i use the blinker both FRONT lights blink on Left or on right.
When I use the blinker both REAR lights work perfectly when using Left Left blinks and Right/Right
When i use the park lights just park lights come on.
When I use park lights and blinker Both FRONT linght blink.

Wiring.. 3 wires out. light blue/dark blue and purple..
purple goes form one light to the other.. Blues go to other wire one on Left one on right.

Ground is through mounting of housing assembly, tried additional ground.. did not help.

assume some kind of feedback issue but I am at the end of my rope on where to look..

Help wellcome.

[dhutton]

Pretty sure it’s a bad ground. I know you tried an extra ground but I’m pretty sure.

Don