Is There a Difference Between Early and Current Measurements of the Universe?

One possibility for this difference is that there is some weird about dark energy that's changing. What it really means is that we just don't know very much about the future of the universe. People are digging into the details of how these measurements were made to look for potential sources of error or bias. That's why it's so valuable to measure these things in multiple different ways, because it checks your understanding.