If you’re using a free plan, builds are likely slower than they are on paid, as noted in the docs.
You’ve not given a lot to go on, if you see the older code on your service it’s usually because the latest deploy failed or the build step wasn’t configured correctly.
If you could share a specific example of the issue you are experiencing that may help us troubleshoot it with you, e.g. any logs/errors/output, specific URLs, service name/ID, reproduction steps, what you expect to see/don’t see, etc. If you don’t want to share these details on the community forum, please feel free to raise a ticket with support@render.com