Welcome to the forum.
There is a good chance that someone can help though this forum is mainly intended for dealiny with R problems. If you have a strictly stats question CrossValidated mmay be a better place to post.
To help we need a reproducible example (reprex)
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: