It looks like some Roblox players are facing another in-game glitch. According to recent reports, the Health Core UI seems to be broken for many, causing confusion as the health bar is not visible.
Users say they tried tapping a kill brick but the health bar didn’t register any loss in HP. Some say they experience the error even after disabling the health GUI.
Source
This is really frustrating if you are playing fighting games as the health bar is not updated with the correct information. While Roblox has yet to acknowledge the issue, it’s still unknown how long a fix will take.
Meanwhile, Roblox is allegedly helping some solve the problem.
workaround
Roblox support helped me fix the issue, that was their solution.
Hi Ryan, Thank you for your patience. We recommend making sure that all Roblox files in the AppData directory are removed. To do this:
Uninstall Roblox from your computer
Open Command Prompt. In Windows 10, you can open it with Start > All apps > Windows System > Command Prompt.
Type the following commands:
cd AppDataLocal (then press enter)
rmdir /s Roblox (then press enter)
Enter “y” when prompted to reply (then press enter)
restart the computer
Reinstall Roblox.
Other than that, users can always add a custom health GUI until Roblox fixes the glitch. Having said that, we will follow up and update this area when Roblox Health Core fixes the UI issue.