I noticed that, too.
It seems these are the currencies that have a working deposit address: BTC, ETH, LTC, XRP, TRX. And by working, I mean their deposit address does show up when they are selected.
The ones that are not working: USDT, USDC, DAI, LINK. All these currencies, when selected does not show a specific deposit address and show "Internal server error" message. Just like what you said, Pmalek, selecting the working currencies generates their specific deposit address, and when switching to the ones that are not working, that deposit address remains.
It's a severe problem for people who are inexperienced or careless, and it can cause their losses by funding their account wrongly. In this announcement thread, through latest posts from discussions, the issue reported to Earnbet and hopefully they will see and read these posts and take action to fix that bug.
I see EOSBet account was active only several days ago so very likely, this issue will not be missed by the Earnbet team.
At the website, there is a chat box, so did you both try to report this issues in their chat?