Need Help with Networking!

I’m having this weird issue with mouse controls, when a remote client logs into my game, his camera starts jiggling either up and down or left and right. This issue happens only if client is too far away from host, for example, my friend is from US, and Host is from Moldova (me), then it starts jiggling on my friends end, but if another friend joins (he’s from Romania, neighbor country), he doesn’t have the same issue as my friend from US.

Here’s the demo from our playtest, player on screen is from US:

Another demo from friend from Romania:

Now i’m confused, what can be the case? please help!

i’ve also uploaded mouse functions bp in case it may help.