Talk:Thresh/Ability Details/@comment-99.139.65.215-20130125114804

Once you have 255 stacks of Damnation they are replaced by "Soul Glutton" which displays the bonuses only for 255 from that point on. At 256 you gain a single stack of Damnation again which will show the correct total amount. At 510 Soul Glutton changes to reflect the bonuses for 510 (it does not gain another stack); once again you will start over at 1 stack of Damnation when you hit 511 and once again the number on Soul Glutton will show an incorrect amount.

This leads me to believe this occurs for every 255 stacks of Damnation.