Alright I did some testing on a different computer and tried multiple browsers and I wasn't able to replicate the issue.
That being said, the problem is most likely some corrupted game files that didn't download correctly when loading the game, restarting your web browser (or entire system) could fix this issue since it redownloads all the files required for the game once you load it.
If more people show the same issue I'll look further into the problem.
Thank you for your feedback tho, it is much appreciated!