A video of the issue:
When players are moving (running), they always are getting back by server, in this time server has 20 tps (spark, sponge). Online of the server: 10-20 players, when it’s night and online is only 2-3 players, there’s the same issue. Restarting the server doesn’t help.
I don’t have this issue on the server with mohist and the same amount of mods
By the way, I don’t have this issue on spongeforge 1.12.2, ± same modpack
Mods: pixelmon, BiomesOPlenty, BooshelfForge, chiselandhabits, WAWLA, costumes, ironchests, placebo, selene. clumps, fastfurnace, fastworkbench, ferritecore, notenoughcrashes, spark, starlight, storagedrawers, treechop, worldedit
Plugins: ChatManager, CommandPack, GTS, Impactor, LocaleAPI, LuckPerms, RegionGuard, TablistBoard
It’s not clumps, fastfurnace, fastworkbench, ferritecore, notenoughcrashes, spark, starlight. Also, it’s not sponge settings as I returned to standard settings and I had the same issue.