One too many closing divs when using conditionals

This is an interesting usage. I think I have done something similar before.

There are a couple of approaches I can think of which might help.

The first is to output your [tabbyending] shortcode from inside an additional true/false conditional so the shortcode only appears when the same conditions to output the [tabby] shortcodes are true.

A second approach would be to use a static variable as a flag in the functions that output the [tabby] shortcodes – initialize the flag as false, then whenever a [tabby] shortcode is output, change the value of the flag to true.

Then check whether the flag is true or false and only output the [tabbyending] shortcode when the flag is true.