TikTok posts auto-sharing to Story, killing my reach

Whenever I post on TikTok, it automatically goes to both feed and story. On my main account, posts get ~8 views in the first hour, then after 24h they disappear from story but stay on the feed (around 140 views total). I’ve run multiple accounts with tens of millions of views, and this feels like it kills the chance to go viral. Anyone else dealing with this or know a fix?