Wrong number of domain ability?

[Simira]

I have a lvl 10 light domain cleric, wisdom 18 +4.

As I read the rules, I get the warding flare ability as many times as my wis-bonus per day/long rest. Which should be 4. From 6th level I can also use improved flare, protecting others than myself.

In HeroLab, I get 5 Warding Flares AND 5 Improved Flare per day. As I understand it, improved flare only changes they way I can use warding flare, it's not an additional ability?
Also, the number seems wrong. I have a stone of good luck, which gives me +1 on ability checks, might this be included in the number of flares per day?

Not a very big deal, I don't expect to overuse it anyway, but would like to understand if there's a bug or there's something I haven't considered in the rules.