Weird problem with Letsencrypt and SNI

Hello, Im facing a problem with a VIP which has more than 1 certificate, Im adding an SNI certificate , and then another certificates which has been made by letsencrypt script for f5.

if client visit example.com the certificate loads well. if client visit it loads the default sni certificate..

in the certificate san it has both www and non-www certificate. What could cause such issue? anyone else has faced this problem?

Thanks!