If this was some tabulation hack, then maybe whatever exploit they used to add or flip votes didn’t easily allow for introducing a full ballot of choices.
If it was human ballot stuffing maybe it was easier to make only one selection so that local county-level choices wouldn’t limit where/when those ballots could be introduced.
That’s how we felt before 2020 anyway. People actively voting for a party trying to destroy democracy changes the calculus a bit and we can no longer ignore the long-term ramifications of placing these kinds of people in power