Switching Issue... maybe?

[Shadowtrance]

Hi
I've built both this and the mega switcher recently. Mega switcher works perfectly so that's awesome. Switch back and forth as you please no issue.
This one though is acting odd, starts off in port 2 (as does mega switcher), switch to port one and can't switch back to port 2 without a power cycle to reset it.
I've tried the obvious of switching the CD4053's and NE555 with known working ones in case they were bad, but they are not.
I assumed they'd both function basically the same for switching as there's only minor differences (ignoring the auto fire....which is disabled).
Kinda has me scratching my head. haha