It happens in all elections, on besides, but in this one there were lots of people who voted Trump, then skipped the rest of the ballot, hence all the swing state dem senators.
There were 3 types of Trump's voters, broadly.
1. The folks described above who skipped the rest of the ballot. These are low-info, ignorant voters not serious about government or elections. They would vote for any repub option.
2. People who dislike Trump but dislike Kamala even more. They want traditional Republican / conservative (or religious-right) policy at all cost. They admit Trump is a POS but are afraid of liberal policy, some are simply misogynistic or racist.
3. Cult members. They believe in pet-eating, bleach injection, pizza gate, presidential hurricane models, "concepts of plans", not releasing taxes, pressuring States to find votes, election denying before a vote is even cast.
So are you low-info & ignorant, agreeing that Trump is a narcissistic, divisive, policy-less POS, or in the Cult?