Hey there! You may want to [url=https://support.steampowered.com/kb_article.php?ref=2037-QEUH-3335]verify the integrity of your game files[/url] and try again. Please note that each encounter can be done once to gain progress. Doing the same encounter multiple times will not progress the triumph. If you have every slot Leviathan themed with a Leviathan exotic, you can complete this triumph in one raid.
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I verified the files like you said, and did the entire raid again from start to finish, there was no change. 0 progress was made.
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I cannot say for sure if it is bugged, but I was able to get this done this season. Very minor people reported this triumph and possibly another raid triumph being bugged. Usually clearing cache helps to get the progress going again. Your best bet is to do it on other characters until it gives you progress.