That depends on how are you reading the data, to help us help you, could you please prepare a repr oducible ex ample (reprex) illustrating your issue? Please have a look at this guide, to see how to create one:
A minimal reproducible example consists of the following items:
A minimal dataset, necessary to reproduce the issue
The minimal runnable code necessary to reproduce the issue, which can be run
on the given dataset, and including the necessary information on the used packages.
Let's quickly go over each one of these with examples: