I didn't have the problem with my account and I tested it directly, because I temporarily posted some short "log follows" end of the last year and corrected it a few days later on january 1st.
But I heard the same problem from other users. Those users needed to refresh the browser page (F5) several times.
Another friend reported, that he also has seen an "old" log (already a correction was done but not registered). After he logged out and in again, the changes got active.
Thus I think there was a relevant change on the geocaching.com website. My fieldnotes where updated without this behaviour, so this is no problem to me.
Also I recognized some "dead minutes" on geocaching.com on different days, between christmas and this weekend. The reason could be many active useres at the same time. In Germany we had very nice weather the last two weeks - geocaching weather