Make sure that you have these things configured correctly:
Add subnet of remote branch to SSLVPN - if using split-network
Phase2 - with correct source/destination subnets including your SSLVPN subnet
Valid firewall policies - on the HQ, from ssl.root (example for root vdom) to Ipsec
And double-check that remote-branch installed subnet of SSLVPN into routing-table so the traffic will not be dropped.
After this, try packet captures/debug flows on HQ and remote branch and see where traffic stops.