Hi @alexlopezleon,
No worries for the late answers 
It could be a cache issue. Have you tried to see if this is happening on different browsers?
We have a preview troubleshooting guide that covers a lot of the different errors that might occur, you could give it a go and see if anything fixes your problem:
If nothing above helps, could you give me a link to your github project so I can test it on my end? Feel free to send it to me via DM if you'd like to keep it private. Thanks!