Can't add new elements

Hi there,

For the training project, I wanted to create a layout of the room, where color gradient is created by light sources. But I can’t create them in sufficient quantity for my purposes. I placed 2 sources of point light and 14 of cone light. After that, when I’m trying to to add one more cone light (15-th), source 14 disappears from render, and 15-th never appears.
Could you tell me, please, what can cause this?

In the patch on the top left there are customizable parameters, responsible for cone light lamps characteristics. Under this unit - the part that is responsible for the color of each individual lamp. Sources, with which the problem occurs, are listed in column.
patch 1.toe (8.41 KB)