Users on these forums may be experts, but have no ESP.
The honest answer, according to the details you give is: Because something is wrong.
Maybe if you put present a detailed network description and post your config someone could give you an advice.
Torturing CCR1009-7G-1C-1S+, RB450G, RB750GL, RB951G-2HnD, RB960PGS, RB260GSP, OmniTIK 5HnD and NetMetal 922UAGS-5HPacD + R11e-5HnD in my home network.
ok i have 4 wan loadbalancing in mikrotik hotspot and pppoe configure on same interface.hotspot run on 10.10.0.1 subnet and pppoe run on 10.11.0.1 subnet.problem is that pppoe user can't access sharing server.