{Membership.Fee} appears on Membership Renewal Reminder emails with 9 decimal places
Similar to the previously reported issue.....
https://github.com/civicrm/civicrm-core/pull/12186
Screenshots and comments can be found on above thread
civiCRM 5.4.0 on Drupal 7
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information