Buy Craft Error 304 HELP!!

[Blured]

Hey guys! I have ran into a pretty weird issue with my BuyCraft, and am wondering how to fix it.

First of all, https://store.UniquePvP.net/ isn't working, showing this error: https://gyazo.com/84ee52663498cacdb29b8572c66a8774
Domain is Hosted at NameCheap
Thirdly, sometimes THIS happens: https://gyazo.com/f586e0e1d8da9704d6566fd68753d3fa

Overall, something is extremely messed up here and i have no clue what it is, any help is appreciated

 

[TricksterPlays]

I am 99% sure your SSL isn't configured properly. See what is up with that.