What gameplay feature is this bug affecting?
Lioness Aging/Item Use

What's the issue? Please include any error messages you receive and as much detail as possible.
Twice I have used a Shadow of Death to bring a lioness into heat. It was a tigon and leopon so I did one Shadow of Death at a time to be careful not to waste any days.

The first time it on the tigon it went from "this lioness will come into heat in 1 day"
To "this lioness is in heat and will be for 2 days."

Assuming this was user error I was very careful to do one day at a time, but got the same result with the leopon.

Any links relating to this bug? For example, if a particular lion is bugging, what is the link to that lion?
The lions seem to work perfectly other than being low on one heat day.

Any screenshots you can provide us with?
I'm on mobile, sorry.

Please provide us with step by step explanation how this bug happened so we can attempt to replicate it. If it's complex, please include screenshots where possible:
I wanted to age up a lioness to induce the next heat
"Will be in heat in 1 real life day"
Use one shadow of death
"Is in heat and will be for 2 days"