max_input_vars is obviously too low it your have 1500+ rows. 1500+ (times) number of fields in each row (plus) all or your other fields.
However, this should not prevent ACF from showing these 1500+ rows in the admin if they exist on the site. max_input_vars only effects form submission and I can’t provide any solution as to why the rows are not appearing on the admin page.
You might want to rethink why you’re using a repeater field here and if there might be a better solution. 1500+ rows seems a little extreme.
