Ordered a Raspberry Pi 4 (CanaKit) and got pi-hole up and running in no time! It’s such an easy setup, and the web interface is handy! Thank you again, DasGeek, for bringing this to our attention 
Also, came across an interesting post in the Pi-hole discourse which the user claims that they are only experiencing partial ad blocking. Another user explains that DHCP is still being served through the router. Right.
I took a look at the “Network” tab of Pi-hole and noticed that some IPs were not being trafficked through Pi-hole, but recognized them, nonetheless. So maybe I was experiencing the same thing as this user? I switched off DHCP on the router and switched on DHCP for Pi-hole. Blam. All IPs were now being served through Pi-hole, and maybe a peace of mind effect happened on my end when I saw the devices light up green listed under the “Network” tab of Pi-hole’s web interface.