Hello,
We have fixed warnings from toolbar -> http://prntscr.com/1yv7pce
but we cannot fix warnings that are in the sidebar because those ones are shown even when use default WooCommerce filter, so please, contact with plugin author to fix it from their side. http://prntscr.com/1yv7vf2
(Our widgets code is based on default WC widgets functions so if you have errors with default ones then you have the same errors with XStore built-in widgets)
In case we switch to the default WooCommerce StoreFront theme, we will have the same errors in the sidebar area ->
backend – http://prntscr.com/1yv4x6l
frontend – http://prntscr.com/1yv50tg
Regards