Thank you for your quick response! It ended up not being related to your theme. It was caused by WP Slimstat and they just pushed out another update. Sorry to have troubled you guys. At first, it appeared to be related to your slider, but it wasn’t.
WP Slimstat 18.104.22.168 [Fix] Some static text ( var_ ) sneaked into the source code. Apologies for the inconvenience.