Deleted Facebook messages still stored on iPhone?

A couple days ago I deleted all my messages from Facebook on the computer because I had way too many I literally never deleted any messages from the day I got a Facebook. I just noticed on my iphone apps (both the Facebook and FB messenger apps) all the messages are still there! Has this ever happened to you before? Should I re-install the apps? Thanks!

Added (1). I want them off my phone too though! I hope my phone realizes I deleted them soon so they are no longer stored there.

If you delete anything on Facebook even if they're photos, they stay on the servers from 2 to 8 months. They were supposed to change that and delete everything instantly but yeah it's nothing to worry about.

It Should be Deleted From Mobile As well When you Deleted it From the PC Since its Not Please Contact Facebook at the Help Center and Report the Problem to them

Also Check And See if Facebook And Facebook messenger Have any Updates Available if there are Any Install them as Quite often Sometimes it fixes Errors

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