in text dice roller issue

When I try to roll multiple times in the same [ ] , only the first die roll works. For example,

[dice=attack] 1d20, 1d20,1d20[/dice]

looks like this:

Roll #1 1d20 15 = 15
d x = 0

I tried this with both Opera and Chrome to be certain. Normally I just write up a separate roll for each attack for example 2 attacks with short bow in 1E, but I wanted to simplify the post.