Tumbleweed - strange font display

[jaketherake]

I’m using TW with KDE on my desktop PC and Slowroll on laptop. On both machines there is a problem with displaying the “:” (colon) character on a specific website. This page is OpenWrt Luci Dashboard Making sure you're not a bot!
I have OpenWrt installed on my cable router and 3 Wi-Fi access points. On all of them in Luci dasboard there is strange symbol instead of colon (att.)

This happens only on OpenSuse (TW on desktop, Slowroll on laptop, I also tried the live cd image of TW and it’s the same). I use firefox and floorp on all machines. With the chromium based browsers there is no sign in this place.
On Windows, Ubuntu, Fedora (under VM) with Firefox everything is ok: there is a colon sign.
Does anyone have any idea what this might be related to?

[swannema]

Install google-noto-sans-symbols2-fonts

[jaketherake]

This is already installed on both SUSE systems.

[rafaellinuxuser]

Check what font is being used, so in Firefox, use Firefox’s Inspector (F12 → Fonts tab):

1. Go to the LuCI dashboard.
2. Right-click on the problematic element (the colon or label that should contain it) → “Inspect”.
3. In the right sidebar, go to the “Fonts” tab.
4. See what font is being applied.an HTML codification fault.

[jaketherake]

font-family: “Helvetica Neue”,Helvetica,Arial,sans-serif;