Problem growing in Rockwool Hugo cubes. Help

Been growing in coco for a long while.
Picked up another location built for growing in Hugo cubes.
Nothing difficult, so I stuck to it.

Location has 2 rooms. Room A is being flashed and Room B is starting week 7.
I feed both rooms with the same formula (about 1200 ppm - 5.8 hp)
Temperatures in both rooms at 79 and humidity at 50.

There are two sectors on a long table in room B that has plants that are burned almost completely. The area in between those two sectors (right in the middle is green and not even near to being burned.

How does it happen? If it would be ph or ppm, everything would be looking burned but it's only in two areas?
Please help me understand this.
Thank you.

AloeRuss said:

Been growing in coco for a long while.
Picked up another location built for growing in Hugo cubes.
Nothing difficult, so I stuck to it.

Location has 2 rooms. Room A is being flashed and Room B is starting week 7.
I feed both rooms with the same formula (about 1200 ppm - 5.8 hp)
Temperatures in both rooms at 79 and humidity at 50.

There are two sectors on a long table in room B that has plants that are burned almost completely. The area in between those two sectors (right in the middle is green and not even near to being burned.

How does it happen? If it would be ph or ppm, everything would be looking burned but it's only in two areas?
Please help me understand this.
Thank you.

Click to expand...

What table setup are you using?

Hi. Thank you for reply.
I am using a basic table with the cubes sitting on it.
I hand top feed them every day.

I also include the picture.

Only one thing that came to mind is this:
If I top feed Rockwool I need to make sure it is fully dranched and saturated with the feeding solution.
When top feeding them whoever, there is no easy way of telling "ok. It is fully wet" like u could tell in coco and if runoff appear on the bottom of the cube doesn't mean it's been thoroughly saturated.
Is it possible that some of them are not getting socked through and through?
That would explain the randomness of the problem.