Hello and welcome to Apple Support Communities, Arrron.
If I understand your post correctly, you want to make sure you aren't charged for both storage plans after updgrading your iCloud storage twice. I'm happy to help.
As long as you used the same Apple ID for both upgrades, you won't be charged for both. The second selection cancels the first and the cost will be prorated.
Here's how it works
Choose from a total of 50GB, 200GB, or 2TB. You can even share the 200GB and 2TB plans with your family. Your storage is upgraded immediately, and your monthly payment date reflects the purchase date for your plan. If you upgrade from one paid plan to another, we’ll cancel your existing plan and charge you the prorated cost* of your new, larger plan.
You're billed every month for your storage plan unless you downgrade your plan. Each month you'll get an email to remind you of your upcoming payment.
For more information about changing your iCloud storage, check out the full article here:
Buy more iCloud storage
Let us know if that resolves this issue for you.
Thanks for using the Apple Support Communities. Take care.