Any help here?

This is an old problem on WP. Members with just numbers or numbers at the beginning of their user names cause the system to parse to the member_id number recorded in table rather than the member_name. *I have not found an automated way to solve the problem.

When I get a new registration I edit their nickname to add an underscore at the beginning which solves the issue. Like so _98765.

You can then run a snippet to block users from changing their Nicknames so that they don't change it back and break the fix. You will have to switch it off every time you get a numbers registration you need to edit.

add_action( 'wp_head', function () { ?>
	<style>

		#wpf-profile-account-form > div > div.wpf-tr.row-0 > div.wpf-td.wpfw-1.row_0-col_0.wpf-row-user_login.wpf-row-display_name.wpf-row-user_nicename.wpf-row-user_email.wpf-row-title.wpf-row-groupid.wpf-row-location.wpf-row-avatar.wpf-row-about.wpf-row-occupation.wpf-row-signature > div.wpf-field.wpf-field-type-text.wpf-field-name-user_nicename.wpf-field-required > div.wpf-field-wrap {
      pointer-events: none;}

	</style>

* There is a plugin that can restrict usernames but it seems overly restrictive https://wordpress.org/plugins/restrict-usernames-emails-characters/ I have not tested it though.