Exceed data limit error after building a relationship to a 17KB file

I have never had any issues exporting data from a visualization until I built a relationship with a new data source (a 17 KB .xlsx). The relationship is linked on a unique identifier, and the data added is a column where each cell contains data seperated by hard return in the cell itself. Example here:

Now when I try to export the data from the visualization, I get the "Exceed data limit error" when I try to export more than 4 rows worth of data. Is there a fix? I don't think the file is large, the most I can export is 5KB worth of data.