So I've imported my data from excel as
Name <- read.csv("C:\\.......csv", header = TRUE, sep = ",")
and named a column of the excel file as a list in R as
Name of list <- c(unique(Name$NameofColumn))
which has worked for me numerous times before, except now, R is only reading new values, and completely ignoring repeat values.
For example, if my excel column was: 3, 4, 3, 5,
R reads it as 3, 4, 5