I'm no expert having only recently set up my RPI4 with a lot of help from here and SGL.
I had a similar issue when I was setting up and was unable to connect to the hotspot from my Win10 Laptop.
It was then explained to me that their is a hierarchy with regards to the internet ( Ethernet - Wireless - Hotspot ).
So once set up if a wireless network is detected then this will be used before a hotspot.
From your description it would appear that you've set up the wireless connection and your laptop etc is picking this up which is why you cannot connect to the hotspot.
I'm sure this is right, but I could ge wrong as it's all new to me