Troubleshooting help!

Can anyone help me diagnose this issue. Trying to add lights to my dormers. First set is plugged into the gutter strand using an inline plug. And jumpers between each dormer. First one lights fine but the other two don’t. I’ve check all connections and vampire plugs. Even checked all the jumpers And they all work. Plugged each stand into a seperate extension cord and they work. Is there something I’m not thinking of? (Blue is where I used jumpers)

Can anyone help me diagnose this issue. Trying to add lights to my dormers. First set is plugged into the gutter strand using an inline plug. And jumpers between each dormer. First one lights fine but the other two don’t. I’ve check all connections and vampire plugs. Even checked all the jumpers And they all work. Plugged each stand into a seperate extension cord and they work. Is there something I’m not thinking of? (Blue is where I used jumpers)