It actually started at 55 days. I accidentally clicked a bookmark and went to another page. When I pressed the back button on my browser to return to Cookie Clicker, it freaked out on me.
The sugar lump menu claimed that I had 55 days left for my next lump. Life got hectic and I was hoping that it would just keep going like it should but it has not corrected itself. I have been at 5 lumps now for 8 days. Currently says I have 46 days left for my next lump.
Attaching screenshot of the message as proof of the bug. If there is something that can be done to fix, hurrah! If not, I just want it out there that it is a thing (and hopefully sometime in the next 46 days it will be fixed).