Using dateRangeInput with BETWEEN logic in SQL

Where are you putting this code? I'm triying to replicate your issue on my postgresql server but works normally for me, the only thing I can think off is that you are putting this code outside a reactive expression.

Could you make a minimal REPRoducible EXample (reprex) about your issue?
Here is a very useful guide about how to make a reprex for a shiny app