Considering that some series have over 5,000 tippers, some who tip repeatedly at 50 coins a time, having each tip as a separate line entry was likely becoming too intensive on the servers.
Now multiply this by 100s and eventually 1000s of creators. . .
We tipped one creator 50 a time as fast as we could and yes, around the 20th tip or so the system started to lag worse and worse.