I am currently registering for honors classes and some are labeled as stacked. What does this mean? Thanks!
It would help if you named your college, since this may be college-specific terminology.
One university system that uses this terminology is the Texas A&M University system, where “stacked honors courses” are those where the honors students attend the regular lectures but may have additional or different assignments or designated honors discussions.
https://engineering.tamu.edu/academics/eh/faq-advisors-faculty.html