Checked with other icon sets and the problem seem to be with Pocillo icon pack or how Budgie handles the status icons. I’ve checked status icons under Pocilio icon folders and there are specific icons for 3G, 4G, WiFi, etc. The problem is ‘L (for LTE I think) with bars’ is superimposed over a WiFi icon.
With gnome icon pack:
With Papirus, on Ubuntu Budgie:
With Papirus, on Ubuntu GNOME: