1. What could be the devices under "other devices" 2. Why are devices appearing twice? 3. Is it possible that part of the data consumed by a device listed separately is also captured under "Other devices"

Hello izuchukwu112,

Other devices could mean those that were connected by USB, as opposed to Wi-Fi. This answer is from a "Solved" post with the same question: Personal hotspot data is being used by “o… - Apple Community

Ways to connect to a Personal Hotspot, can also be helpful:

How to set up a Personal Hotspot on your iPhone or iPad - Apple Support

Connect to Personal Hotspot with Wi-Fi, Bluetooth, or USB

Apple has a YouTube video which has information about Personal Hotspots which may help:

https://www.youtube.com/watch?v=ltgk8FiVHoE

For additional questions, this would be something to contact your mobile provider, as the Personal Hotspot is provided by them.

Take care!