maybe you downloaded a map, or something with the drek particles.
The particle templates can be repeated anywhere!
in the feralheart directory, make a search of all files ended with _0.particle and _1.particle, and delete all these files.
this are all drek particles that it duplicates when you export a map:
Blue-Orange-2_0.particle
Blue-Orange_0.particle
Blue-Rings-1_0.particle
Blue-Rings-2_0.particle
Blue-Rings-3_0.particle
DrekBarbarian_0.particle
DrekEarthCast_0.particle
DrekGuardian_0.particle
DrekIceFire_0.particle
DrekInferno_0.particle
DrekLightCast_0.particle
DrekMassElementalCast2_0.particle
Effects-1_0.particle
EverLastDrek_0.particle
Green-Ring_0.particle
Gyroscope_0.particle
RandomFireAura_0.particle
VenomFlare_0.particle