Menu Order Not Updated / Repeated

Hi there

I use your plugin a long time ago, always with success.

Otherwise today I could not save the new order, I tried all and nothing untill I found two posts had the same menu order number… and one of them jumped to the top always, once and again… after drag and drop + save the post jumped to the top.

I needed to change manually those 2 menu order and all the rest of course. After I did it I could use again your plugin.

In websites where I have thousands of posts this will be a big problem.

Any idea why happens this?

Thanks in advance!