You are confusing the different systems of the Democrat and Republican caucuses. Republicans have always had a secret ballot vote. Democrats separate into groups, have viability percentages, and a second vote.
At the Republican caucus we vote, count ballots, announce the results, and report them on the online app. After that some people leave. We move on to elect county Central Committee members, delegates to the county GOP convention March 12, and discuss platform planks.
To find your precinct and caucus location visit
https://sos.iowa.gov/elections/voterreg/pollingplace/search.aspx
Many thanks....