Nigara artefacts in UE5.1

Hi!
I’m in trouble with a fire pack downloaded from UE Marketplace.

Does anyone know how to remove those strange artifacts that affect my small bonfire BP?

Also, when I hit the play button the same BP rescaled to 0.1/0.1/0.1 goes back to his original scale… what is the proper way to scale such effects?

Thanks so much,
G

msg104329524-282268

The title got me laughing XD