There is one strange problem, that I don't know where to write. When I use bungeecord for sponge-server there was a problem with mod ActuallyAdditions. Interface buttons don't work. I run server only with sponge - it works well. Once connect with bungee - buttons not working. Something similar was discussed here: SpongePowered/SpongeForge#1394 I don't know what to do and who to contact...

I don't support Sponge, sorry.

I think it may not have anything to do with sponge, since it only happens when using bungeecord.
Similar problems occurred in the past with other mods, thaumcraft being one big example. It had something to do with packets/entity ids. Take a look at SpongePowered/SpongeForge#731 if you may..