triplicity rulers of cancer

1
http://www.skyscript.co.uk/essential_dignities.html
mars and mars are the day/night ruler of water signs by ptolemy?
I thought that looked funny cuz I remembered it from a different thing. Like I felt like it was a copy/paste error or something that didn't get noticed(somehow)

this seems to explain that there is 2 systems
http://cura.free.fr/decem/09simei.html

What do you guys do.
I was just looking at a Venus in Cancer (it's a day chart)
venus in the 1st decanate apparently that's face(do I have to double check that too?)
software said it was all dignified... and like way way accidentally dignified
so i wonder why and I find *this* problem right away in my attempts to think like a traditional

I kind of had in my feeling that cancer would be swell sign for venus. Mars is fall there.. so is mars not so bad in cancer sometimes, or is venus a bit nicer sometimes...

I was wondering what you guys do?