Windows 8 phone, Messaging App Thread Messed up

[Randolf Marasigan]

I had this Lumia 521 for almost a year now, last week, I started receiving text messages from my friends but their name shows up with a "", and their phone number is enclosed with <>. I tried to reply to their message but my reply will show up at the left side as well instead of the right side of the thread. See screenshots using the links below:
https://1drv.ms/f/s!AnGn00Lk4E6eujemBAEuyk8eqtpK

 

[Chintan Gohel]

first check to see if messaging backup is on in backup
Second, check in accounts to see if your email account has any errors
Can you also try updating your phone if there are any updates?