Blend tool overlapping objects are not seen

[Candy_max]

I created a chain of lights using bland tool along a curve line. Altough, mos of the lights are not seen and it seems like some ojects are covering another while been invisible themselves. So what the problem? I'd appreciat some halp. 

[Candy_max]

[Monika Gause]

Select the blend and then in the transparency panel uncheck the option "Knockout group".

You might need to "Show options" in order to make that option visible.

[tromboniator]

In the Effect menu click on Document Raster Effects Settings

Adjust the value so that the size of the effect on one object does not overlap another object.

You may have to select and slightly move the blend for the change to visibly take effect.

Peter