There is a mismatch with the total issue count for a repo in Filter page and in the actual Github repo.
For example:
For freecodecamp here the total issue count is showing as 234

But if we check github repo, there we can see the total issues count is 174
So there is a mismatch in the total issue. This is probably the response github is sending, that itself does not have the updated data so probably a issue at Github API side.