'git-crypt status' with the '-f' option to stage an encrypted version fails for me?

`git-crypt status` tells me about some "staged/comited" files that are NOT encrypted, but should be.

And then tells me to run "**Run 'git-crypt status' with the '-f' option to stage an encrypted version.**"

```
not encrypted: .git-crypt/.gitattributes
not encrypted: .gitattributes
not encrypted: .gitignore

not encrypted: etc/config/uhttpd
encrypted: etc/config/wireless *** WARNING: staged/committed version is NOT ENCRYPTED! ***
not encrypted: etc/dnsmasq.conf
encrypted: etc/dropbear/dropbear_dss_host_key *** WARNING: staged/committed version is NOT ENCRYPTED! ***
encrypted: etc/dropbear/dropbear_rsa_host_key *** WARNING: staged/committed version is NOT ENCRYPTED! ***
not encrypted: etc/firewall.user

encrypted: etc/shadow *** WARNING: staged/committed version is NOT ENCRYPTED! ***
not encrypted: etc/shells
not encrypted: etc/sysctl.conf
not encrypted: etc/sysupgrade.conf
encrypted: etc/uhttpd.crt *** WARNING: staged/committed version is NOT ENCRYPTED! ***
encrypted: etc/uhttpd.key *** WARNING: staged/committed version is NOT ENCRYPTED! ***

Warning: one or more files is marked for encryption via .gitattributes but
was staged and/or committed before the .gitattributes file was in effect.
Run 'git-crypt status' with the '-f' option to stage an encrypted version.
```

`git-crypt status -f`

it returns with:

```
Error: etc/config/wireless: still unencrypted even after staging
Error: etc/dropbear/dropbear_dss_host_key: still unencrypted even after staging
Error: etc/dropbear/dropbear_rsa_host_key: still unencrypted even after staging
Error: etc/shadow: still unencrypted even after staging
Error: etc/uhttpd.crt: still unencrypted even after staging
Error: etc/uhttpd.key: still unencrypted even after staging
Unable to stage 6 files.
```

What now? How do I fix this?