Linking objects produces weird results I'm doing a blender course in which I'm modeling a patch of grass. I had to make several patches using a Particle System and applying a Particle system and making several variations on the same patch using all the different settings for scaling, rotation etc.

Now I want to link all the individual strands in a patch together. I click one strand, then use Shift to select them all, then press Ctrl + J . And then Boom! This mumbo-jumbo appears.

I follow every step of the tutorial exactly as described, and also other tutorials on youtube on this subject. I have not been able to find anything about this particular error.
You don't have to do all this as Random option is available in the particle system settings in regard to the particles' scale and rotation. Use it.