IOS 9.3.1 Mail - Mark As Read

So i was plagued with over 4gb of storage being used up by 'other' on my iphone 5S running IOS 8.1 which i loved, so the idea was to wipe all data off my phone and then do a restore....

Well....whilst performing a factory reset on my phone it decided to start doing a boot loop error, blue screen apple logo blue screen apple logo....GREAT!

The only way i could recover my phone by allowing iTunes (which i hate) to restore my phone with the 'oh so fantastic' IOS 9.3.1

Now although my phone is mostly restored to how it was i have issues with the mail app! I send over 100 emails a day and now i cant mark any of them as 'read'

See the screen shots below (and before any asks yes i HAVE set up the swipe to settings, deleted the account, re-added the account, done a soft reset, hard reset, cleared the ram, chuck it on the floor etc)

THANKS APPLE FOR RUINING A PERFECTLY GOOD PHONE