Entries not saving

My entries are not saving. I have typed today’s three times and every single time after I press the green arrow the entry is simply not there. I paid for the app a couple of days ago, I’m using v.1.7.7 on and iPhone 6 Plus. It does the same thing with entries with or without pictures. 

Sometimes I get a little circle in the top centre on the screen, like something was loading but then nothing happens.