I noticed a bug with HP calculated from the Constitution when you level up from an 8 Constitution with a -1 modifier. You should have a 0 HP Bonus as a result of the level up. See image below. What should happen is that the Constitution should increase by 1 per level. 

Notice the Hit Point Bonuses

It seems correct to me.

A level 1, you get 8 HP, with is in accord to the PHB, and at the second level, you get 5 HP.

8 + 5 = 13

I'm trying to understand why the Hit Point Bonuses is -2 when the Constitution modifier is -1.

You are at level 2, right? You have 2 hit dice, right? 

With a CON modifier of -1, the modifier is counted as many times as the number of hit dice, so it is a total of -2 on the total count of HP.

Yes, level 2, correct.

Hit Dice: 1d8 per druid level
Hit Points at 1st Level: 8 + your Constitution modifier
Hit Points at Higher Levels: 1d8 (or 5) + your Constitution modifier per druid level after 1st

Ah, so it will go up or down based on level? So it doesn't add 1 per level?

Let's break it down, assuming a -1 Con modifier.

1st level: 8 + Con modifier = 7.

2nd level: 5 + Con modifier = 4

Total HP at level 2 = 7 + 4 = 11.

Ok now I get it, the -2 bonus threw me off.

Thanks.

so my consitiuion is a plus 1 yet the hit point thing was a plus 4. anyone know how that works

Quote from Hardison009 >>

so my consitiuion is a plus 1 yet the hit point thing was a plus 4. anyone know how that works

 What level is your character?