Can't see my friend's skin

the title is pretty much self explanatory. When my friend joins the server i've made their skin dissapears
the odd thing is, when i rejoin the server, i actually can see their skin on them for less than a second, but after that it changes to a default one. they can see both their own and my skin without any problems, so i think the issue is on my side.
the online mode is set up as true, so i don't know if the problem is in that either
does anyone know why it happens and how can i change this?

still need help, pls,,

Quote from Roman

Which software and version is your server running?

just a 1.17.1 java edition server with fabric 1.17.1 (0.11.6)
if this info is needed too, there is two mods installed, which are fabric api 0.37.0 and origins 1.0.3