WHY were my final two individual returns held at Lacerte for 2 days so that they missed the e-file cut-off?

I have e-postmarks on these two returns of 5/17 PM PST and 5:57 PM PST. The California returns went through immediately (without waiting for federal acceptance).

This was the time posted in the notice posted from Lacerte notifications:  Individual     Saturday, November 17, 2018 at 11:59 PM EDT. (In the first place, it is no longer daylight time so the article is incorrect and did not agree with the Critical heading issued 10-17-2018 at 3:25PM).

What happened? How can I explain this to clients?! I depend on your software!