You need a URL that will allow the portal to load a specific portal table even if it is not the first in the list. You need to do the following:
Remove the recordid parameter from the URL
Here is an example of the Record URL formula
'https://web.miniextensions.com/kLFbwMUXKgrsExF5jy7T?fieldId=fld8QDEJdKEyD7Tr3&recordId=' & RECORD_ID()
Now, it should look like this
https://web.miniextensions.com/kLFbwMUXKgrsExF5jy7T?fieldId=fld8QDEJdKEyD7Tr3