If you have a recent theme duplicate or backup try that.
Beyond that actually troubleshooting something like that without reference urls is a guessing game, and even with urls it can take alot of poking around to find the core problem.
If you need this customization then contact me by email for services.
Contact info in forum signature.
ALWAYS please provide context, examples: store url, theme name, post url(s) , or any further detail in ALL correspondence.
This is for sure caused by malformed code in your theme
Did you recently install an app or adjust any of the theme code?
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