strange budget allocation

we created our first campaign. single ad group. three very different videos. targeted to hashtag interactions. started printing money. however, our CPx is increasing steadily over time. the strange thing is tiktok is putting 95% of the spend into a single ad even though the other two seem to have better CPC/CPM. should i be intervening? does tiktok know something i don’t?

budget was $50/day bumped up to $100. when it first went live it was printing cash but its slowed down. wanted to scale it up to $500/day or more but losing confidence.

https://preview.redd.it/vykp1zhevdce1.png?width=1846&format=png&auto=webp&s=541a27d8b8e06c9914b9c9b0eccc9a9c004afb42