cell bug

[loafey]

I do not know why, but when sometimes when i click on a live cell, instead of turning it into dead it is still alive.

[Vort]

Broken mouse maybe?
When switches fail, they can produce double clicks instead of single clicks.

[speedydelete]

In what program?

In LifeViewer, this can be caused by accidentally turning off smart drawing (the lightbulb button in the top left), I don't know about Golly.