Paul Heyman has been causing "controversy" backstage by changing Brock Lesnar's segments to meet his own tastes, according to the Wrestling Observer Newsletter.
The Beast Incarnate's "advocate" is said to have enough sway with Vince McMahon that he is able to change the direction of promos in which his client is involved without being challenged.
Despite the support of the chairman, Heyman's decisions are supposedly causing tension with WWE writers, who believe that Lesnar would be more open to different ideas without his friend in his ear.
Heyman - who has previously worked as a booker - does not officially hold any creative privileges in his current capacity with WWE, although Lesnar has made no secret of how much he values his opinion.
Former UFC star Lesnar returned to the company in 2012 after an eight-year absence, and has been working a part-time schedule ever since.
It has been reported that the 40-year-old is stalling over new contract negotiations, amid speculation that he could make a permanent return to MMA when his current deal expires after WrestleMania 34.
Lesnar allegedly met UFC officials in the summer to discuss a potential return, although he has not commented publicly on the rumours.