SSL inspection fails for some sites

[compunction]

I am trying to setup SSL inspection for a few machines on my network.  I setup Squid in transparent mode with port forward.  I am able to get to https://www.yahoo.com without issue but if I try to get to https://opnsense.org I get the following error in the cache.log.

2017/09/06 14:13:08 kid1| Error negotiating SSL connection on FD 26: error:140A1175:SSL routines:ssl_bytes_to_cipher_list:inappropriate fallback (1/-1)

I am using an internal CA and I have imported the certificate into the browsers trusted root.

Any idea's?