Im new to play boxing

i have started in January Raf links in 4 accounts (3 new ones, 5 total).
4 accounts RaF linked, int this way:

account 1 unlinked // account 2-->account 3 account 3--> account 4 account 3 --> account 5

this strange choice of links because my acc1 was full and acc2 almost full.

Currently levelling mage squad (x4) with pala tank from account 1.

Xp boost works fine for me.
Probably issue is higher level character ("booster") in linked account