I also had this on the plain street, it was a callout where I needed to apprehend a wanted suspect. I think is not particularly the callout but the fact that other cops are aiming the suspect and I don't know which plugin made them appear.
Hey,
I think there is a compatibility problem with stop the ped plugin. Since i've installed super callouts it's impossible for me to takedown a suspect, it juste move randomly if there is other cops aiming. Btw it's not backup from Ultimate Backup, i don't know where they came.
If you want to take a look: