Aeros badly clipping with Fender Tonemaster Pro

hi folks, this is my first time posting here.
i’ve always put Aeros at the end of my signal chain in the effects loop of my amp and have had great results.
i recently got a Fender Tonemaster Pro & their 10” FRFR cabinet. when i run Aeros after the amp and all the mod effects in loop 3 or 4 of the Tonemaster i get horrible clipping. it’s like the post power amp signal is hitting the Aeros instead of the post pre-amp signal. when i put the Aeros in front of the amp it works fine but i lose the ability to capture my mod effects in the loop.
any advice on how to set this up correctly would be much appreciated.
thanks, Mark