Hi,
this is a big issue nowsadays as the standard of reading websites has changed from http to https. Sites they don't provide https content or have some hardcoded http links will be banned by most search enginges and almost by Google.
I found in your templates hardcoded linnks like this one:
fonts.googleapis.com/css?family=Roboto:400,100,700
)
Please change it to https for current and for futured templates.
Thanks