Bug

I have noticed this happening for a long time now but I guess it never really cost me any important games so I didn't bring it up.

In many leagues I have been in the pitching rotation seem to skip a spot towards the end of the season. It's not a " day off ". The scheduled pitcher just gets skipped and the rotation moves on to the next guy ( who ends up pitching without enough rest). Then the guy who got skipped piches the next day. It's a weird thing that I feel like probably happens all the time but unless you are paying attention it goes unnoticed.

Hi - there is probably some other explanation because this would not have gone unnoticed by people. Are you sure it's not the random days off per division in Auto Leagues? Here's how it works (it's noted on the full Schedule page, but I'm sure not everyone has seen it:)

To allow for variety of pitching matchups in Auto Leagues, each division is given one scattered day off per half according to the following schedule:

Ruth: before day 20 and before day 120.
Robinson: before day 40 and before day 140.

is this something the custom league scheduler can do too?

Not yet, no.