Frontend display not working

[xhhdd]

Specific questions

It was probably only 1 or 2 years ago that I used the YOURLS + Sleeky combination and I was very impressed with the beauty and generosity of the Sleeky.

However, when I installed it yesterday, I found that the frontend of sleeky was not working properly

As with the screenshot above, the foreground doesn't seem to be displaying correctly, not as I remembered before, it seems to be YOURLS based but Sleeky display is incomplete.

The screenshot above is the backend and this feels fine.

Specific configurations

YOURLS: 1.91
Sleeky: 2.50
php: 7.4 and above have been attempted

Finally

Thank you all in advance and I hope the developers and everyone else can solve my problem