Due to a bug with iOS very long moments will appear truncated (cut off showing '...' at the end) when viewing them on a day. To see the full text you will need to view the moment in edit mode (i.e. by editing the moment).
We have reported this issue and are awaiting Apple to fix the bug. In the meantime we're looking at ways to work around this that won't affect Momento in the long term. Sorry for any inconvenience this has caused.